John Deere 915, 925, 935 Mower Diagnostic Technical Manual TM1727
915, 925 and 935 Rotary
Mower Conditioners
Diagnostic and Repair
TECHNICAL MANUAL
Mower Conditioners models 915, 925, 935
TM1727 01 SEP 00 (ENGLISH)
John Deere Agriculture Pinted by Belgreen
Table of contents
FOREWORD
JOHN DEERE DEALERS
SERVICE TECHNICIAN RESPONSE
Section 10 - GENERAL
Group 05 - Safety
Group 10 - Specifications
Group 15 - General Information
Group 20 - Lubricants
Section 20 - POWER TRAIN
Group 05 - General Information
Group 10 - Diagnosing Malfunctions
Group 15 - Driveline Repair
Group 20 - Main Drive Gear Case-915
Group 21 - Main Drive Gear Case-925/35
Group 25 - Slip Clutch
Group 30 - Belt Drive
Group 35 - Cutterbar Drive Gear Case-915
Group 36 - Cutterbar Drive Gear Case-925/35 (Early Machines)
Group 37 - Cutterbar Drive Gear Case-925/35 (Later Machines)
Section 30 - CUTTING COMPONENTS
Group 05 - General Information
Group 10 - Diagnosing Malfunctions
Group 15 - Cutterbar Assembly
Group 20 - Disks and Knives
Section 40 - PLATFORM-915
Group 05 - General Information
Group 10 - Platform Repair
Section 41 - PLATFORM-925/35
Group 05 - General Information
Group 10 - Platform Repair
Section 50 - CONDITIONER
Group 05 - General Information
Group 10 - Diagnosing Malfunctions
Group 15 - Roll Bearings and Arms
Group 20 - Rolls
Group 25 - Impeller
Section 60 - CARRIER FRAME AND TONGUE-915
Group 05 - General Information
Group 10 - Diagnosing Malfunctions
Group 15 - Carrier Frame
Group 20 - Tongue
Section 61 - CARRIER FRAME AND TONGUE-925/35
Group 05 - General Information
Group 10 - Diagnosing Malfunctions
Group 15 - Carrier Frame
Group 20 - Tongue
Section 70 - HYDRAULICS-915
Group 05 - General Information
Group 10 - Diagnosing Malfunctions
Group 15 - Lift Cylinder
Section 71 - HYDRAULICS-925/35
Group 05 - General Information
Group 10 - Diagnosing Malfunctions
Group 15 - Lift Cylinders
Group 20 - Tongue Positioner Cylinder (Optional)
Group 25 - Tilt Cylinder (Top Link) (Optional)
Section 80 - MISCELLANEOUS
Group 05 - Wheels and Wheel Support Assembly
Group 10 - Electrical Repair
Section 99 - DEALER FABRICATED TOOLS
Group 05 - Dealer Fabricated Tools
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Foreword
This manual is written for an experienced technician Essential tools required in performing certain service work are identified in this manual and are recommended for use.
Live with safety: Read the safety messages in the introduction of this manual and the cautions presented throughout the text of the manual
This is the safety-alert symbol When you see this symbol on the machine or in this manual, be alert to the potential for personal injury
The technical manual contains two types of information: diagnostics and repair. Diagnostic groups help you identify the majority of routine failures quickly. Repair groups tell how to repair the components.
Information is organized in groups for the various components requiring service instruction. At the beginning of each group are summary listings of all applicable essential tools, service equipment and tools, other materials needed to do the job, service parts kits, specifications, wear tolerances, and torque values.
Binders, binder labels, and tab sets can be ordered by John Deere dealers direct from the John Deere Distribution Service Center
This manual is part of a total product support program.
FOS MANUALS-REFERENCE
TECHNICAL MANUALS-MACHINE SERVICE
COMPONENT MANUALS-COMPONENT SERVICE
Fundamentals of Service (FOS) Manuals cover basic theory of operation, fundamentals of troubleshooting, general maintenance, and basic type of failures and their causes. FOS Manuals are for training new personnel and for reference by experienced technicians.
Technical Manuals are concise guides for specific machines Technical manuals are on-the-job guides containing only the vital information needed for diagnosis, analysis, testing, and repair
Component Technical Manuals are concise service guides for specific components. Component technical manuals are written as stand-alone manuals covering multiple machine applications.
John Deere Dealers
IMPORTANT:
Please remove this page and route through your service department. Your current TM is obsolete, discard TM1727 dated 28OCT98.
Listed below is a brief explanation of “WHAT” was changed or added: Complete manual has been updated/revised New gear case information added for 925/35 machines
Service Technician Response
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TM1727-915, 925, and 935 Rotary Mower-Conditioner Technical Repair Manual
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Group 05 - Safety
Recognize Safety Information
Safety-alert symbol
This is a safety-alert symbol. When you see this symbol on your machine or in this manual, be alert to the potential for personal injury.
Follow recommended precautions and safe operating practices.
Understand Signal Words
Signal Words
A signal word-DANGER, WARNING, or CAUTION-is used with the safety-alert symbol DANGER identifies the most serious hazards
DANGER or WARNING safety signs are located near specific hazards General precautions are listed on CAUTION safety signs CAUTION also calls attention to safety messages in this manual
Follow Safety Instructions
Safety Messages
Carefully read all safety messages in this manual and on your machine safety signs. Keep safety signs in good condition. Replace missing or damaged safety signs. Be sure new equipment components and repair parts include the current safety signs. Replacement safety signs are available from your John Deere dealer.
Learn how to operate the machine and how to use controls properly Do not let anyone operate without instruction
Keep your machine in proper working condition. Unauthorized modifications to the machine may impair the function and/or safety and affect machine life
If you do not understand any part of this manual and need assistance, contact your John Deere dealer.
Operate Mower-Conditioner Safely
Safety Art-Fingers Cut Off
Safety Art-Toes Cut Off
Keep all shields in place.
Never hand feed material into machine.
Do not lean against, sit, or stand on cutterbar curtain or their supporting framework
Do not operate mower-conditioner with cutterbar in raised position.
Regularly check that disks and knife bolts are tight
Impeller conditioner; Make sure tines are securely fastened on rotor.
Always operate machine at rated speed
Drive slowly over rough ground
Keep Riders Off Machine
Safety Art-Rider Falling Off
Keep riders off
Riders are subject to injury such as being struck by foreign objects and being thrown off of the machine. Riders also obstruct the operator′s view resulting in the machine being operated in an unsafe manner
Handle Fluids Safely-Avoid Fires
Avoid Fires
When you work around fuel, do not smoke or work near heaters or other fire hazards
Store flammable fluids away from fire hazards. Do not incinerate or puncture pressurized containers.
Make sure machine is clean of trash, grease, and debris
Do not store oily rags; they can ignite and burn spontaneously.
Prepare for Emergencies
First Aid Kit
Be prepared if a fire starts.
Keep a first aid kit and fire extinguisher handy
Keep emergency numbers for doctors, ambulance service, hospital, and fire department near your telephone.
Handle Chemical Products Safely
Material Safety Data Sheet
Direct exposure to hazardous chemicals can cause serious injury Potentially hazardous chemicals used with John Deere equipment include such items as lubricants, coolants, paints, and adhesives
A Material Safety Data Sheet (MSDS) provides specific details on chemical products: physical and health hazards, safety procedures, and emergency response techniques
Check the MSDS before you start any job using a hazardous chemical. That way you will know exactly what the risks are and how to do the job safely. Then follow procedures and recommended equipment.
(See your John Deere dealer for MSDS’s on chemical products used with John Deere equipment.)
Avoid High-Pressure Fluids
High-Pressure Fluids
Escaping fluid under pressure can penetrate the skin causing serious injury
Avoid the hazard by relieving pressure before disconnecting hydraulic or other lines Tighten all connections before applying pressure
Search for leaks with a piece of cardboard. Protect hands and body from high pressure fluids.
If an accident occurs, see a doctor immediately Any fluid injected into the skin must be surgically removed within a few hours or gangrene may result. Doctors unfamiliar with this type of injury should reference a knowledgeable medical source. Such information is available from Deere & Company Medical Department in Moline, Illinois, U.S.A.
Stay Clear of Rotating Drivelines
Rotating Drivelines
Entanglement in rotating driveline can cause serious injury or death
Keep tractor master shield and driveline shields in place at all times. Make sure rotating shields turn freely.
Wear close fitting clothing Stop the engine and be sure PTO driveline is stopped before making adjustments, connections, or cleaning out PTO driven equipment
Avoid Injury From Thrown Objects
Safety Art-Objects Thrown at Person
Extreme care must be exercised to avoid injury from thrown objects. Do not, under any circumstances, operate the mowerconditioner when other people are in the vicinity. Stones and other objects can be thrown great distances by the rotating cutting blades.
The cutterbar curtain is very important to reduce the potential for thrown objects Always keep the curtain down when operating the mower-conditioner. Replace the curtain if it becomes worn or damaged. For additional operator protection from thrown objects, it is required that this mower-conditioner be used with a tractor equipped with a complete operator enclosure.
Use Safety Lights and Devices
Prevent Collisions
Prevent collisions between other road users, slow moving tractors with attachments or towed equipment, and self-propelled machines on public roads Frequently check for traffic from the rear, especially in turns, and use hand signals or turn signal lights
Use headlights, flashing warning lights, and turn signals day and night. Follow local regulations for equipment lighting and marking Keep lighting and marking visible and in good working order Replace or repair lighting and marking that has been damaged or lost
Use a Safety Chain
Safety Chain
A safety chain will help control drawn equipment should it accidentally separate from the drawbar.
Using the appropriate adapter parts, attach the chain to the tractor drawbar support or other specified anchor location Provide only enough slack in the chain to permit turning
See your John Deere dealer for a chain with a strength rating equal to or greater than the gross weight of the towed machine. Do not use safety chain for towing
Tow Loads Safely
Tow Loads
Stopping distance increases with speed and weight of towed loads, and on slopes Towed loads with or without brakes that are too heavy for the tractor or are towed too fast can cause loss of control Consider the total weight of the equipment and its load.
Observe these recommended maximum road speeds, or local speed limits which may be lower:
If towed equipment does not have brakes, do not travel more than 32 km/h (20 mph) and do not tow loads more than 1 5 times the tractor weight
If towed equipment has brakes, do not travel more than 40 km/h (25 mph) and do not tow loads more than 4 5 times the tractor weight.
Ensure the load does not exceed the recommended weight ratio Add ballast to recommended maximum for tractor, lighten the load, or get a heavier towing unit The tractor must be heavy and powerful enough with adequate braking power for the towed load Use additional caution when towing loads under adverse surface conditions, when turning, and on inclines
Support Machine Properly
Support Properly
Always lower the attachment or implement to the ground before you work on the machine. If you must work on a lifted machine or attachment, securely support the machine or attachment. If left in a raised position, hydraulically supported devices can settle or leak down.
Do not support the machine on cinder blocks, hollow tiles, or props that may crumble under continuous load Do not work under a machine that is supported solely by a jack. Follow recommended procedures in this manual. When implements or attachments are used with a tractor, always follow safety precautions listed in the implement operator′s manual.
Wear Protective Clothing
Protective Clothing
Wear close fitting clothing and safety equipment appropriate to the job
Prolonged exposure to loud noise can cause impairment or loss of hearing
Wear a suitable hearing protective device such as earmuffs or earplugs to protect against objectionable or uncomfortable loud noises.
Operating equipment safely requires the full attention of the operator. Do not wear radio or music headphones while operating machine
Work in Clean Area
Before starting a job:
Clean work area and machine. Make sure you have all necessary tools to do your job. Have the right parts on hand
Read all instructions thoroughly; do not attempt shortcuts
Moving Parts
Tie long hair behind your head Do not wear a necktie, scarf, loose clothing, or necklace when you work near machine tools or moving parts. If these items were to get caught, severe injury could result. Remove rings and other jewelry to prevent electrical shorts and entanglement in moving parts
Illuminate Work Area Safely
Work Area Safely
Illuminate your work area adequately but safely Use a portable safety light for working inside or under the machine Make sure the bulb is enclosed by a wire cage The hot filament of an accidentally broken bulb can ignite spilled fuel or oil
Replace Safety Signs
Safety Signs
Replace missing or damaged safety signs See the machine operator’s manual for correct safety sign placement
Use Proper Lifting Equipment
Proper Lifting Equipment
Lifting heavy components incorrectly can cause severe injury or machine damage
Follow recommended procedure for removal and installation of components in the manual.
Remove Paint Before Welding or Heating
Toxic Fumes
Avoid potentially toxic fumes and dust
Hazardous fumes can be generated when paint is heated by welding, soldering, or using a torch.
Remove paint before heating:
Remove paint a minimum of 76 mm (3 in ) from area to be affected by heating
If you sand or grind paint, avoid breathing the dust Wear an approved respirator
If you use solvent or paint stripper, remove stripper with soap and water before welding Remove solvent or paint stripper containers and other flammable material from area. Allow fumes to disperse at least 15 minutes before welding or heating.
Do all work in an area that is ventilated to carry toxic fumes and dust away.
Dispose of paint and solvent properly
Avoid Heating Near Pressurized Fluid Lines
Flammable spray can be generated by heating near pressurized fluid lines, resulting in severe burns to yourself and bystanders. Do not heat by welding, soldering, or using a torch near pressurized fluid lines or other flammable materials. Pressurized lines can be accidentally cut when heat goes beyond the immediate flame area.
Service Tires Safely
Explosive Tire and Rim Parts
Explosive separation of a tire and rim parts can cause serious injury or death
Do not attempt to mount a tire unless you have the proper equipment and experience to perform the job.
Always maintain the correct tire pressure Do not inflate the tires above the recommended pressure Never weld or heat a wheel and tire assembly The heat can cause an increase in air pressure resulting in a tire explosion Welding can structurally weaken or deform the wheel
When inflating tires, use a clip-on chuck and extension hose long enough to allow you to stand to one side and NOT in front of or over the tire assembly Use a safety cage if available
Check wheels for low pressure, cuts, bubbles, damaged rims or missing lug bolts and nuts.
Keep Area Clean
Understand service procedure before doing work. Keep area clean and dry.
Never lubricate, service, or adjust machine while it is moving Keep hands, feet , and clothing from power-driven parts
Disengage all power and operate controls to relieve pressure Lower equipment to the ground Stop the engine Remove the key. Allow machine to cool.
Securely support any machine elements that must be raised for service work
Keep all parts in good condition and properly installed. Fix damage immediately. Replace worn or broken parts. Remove any buildup of grease, oil, or debris.
On self-propelled equipment, disconnect battery ground cable (-) before making adjustments on electrical systems or welding on machine
On towed implements, disconnect wiring harnesses from tractor before servicing electrical system components or welding on machine
Use Proper Tools
Proper Tools
Use tools appropriate to the work. Makeshift tools and procedures can create safety hazards.
Use power tools only to loosen threaded parts and fasteners
For loosening and tightening hardware, use the correct size tools. DO NOT use U.S. measurement tools on metric fasteners. Avoid bodily injury caused by slipping wrenches.
Use only service parts meeting John Deere specifications.
Construct Dealer-Made Tools Safely
Construct Dealer-Made Tools Safely
Faulty or broken tools can result in serious injury When constructing tools, use proper, quality materials, and good workmanship
Do not weld tools unless you have the proper equipment and experience to perform the job
Dispose of Waste Properly
Recycle Waste
Improperly disposing of waste can threaten the environment and ecology. Potentially harmful waste used with John Deere equipment include such items as oil, fuel, coolant, brake fluid, filters, and batteries.
Use leakproof containers when draining fluids. Do not use food or beverage containers that may mislead someone into drinking from them.
Do not pour waste onto the ground, down a drain, or into any water source
Air conditioning refrigerants escaping into the air can damage the Earth’s atmosphere. Government regulations may require a certified air conditioning service center to recover and recycle used air conditioning refrigerants
Inquire on the proper way to recycle or dispose of waste from your local environmental or recycling center, or from your John Deere dealer.
Live With Safety
Safety Systems
Before returning machine to customer, make sure machine is functioning properly, especially the safety systems Install all guards and shields
Group 10 - Specifications
Mower-Conditioner Specifications
[ (Specifications and design subject to change without notice ) ] -915
915 Mower-Conditioner Specifications
TRACTOR REQUIREMENTS
Power Take-Off
Horsepower
Hydraulic Pressure To Lift
540 rpm
41-56 kW (55-75 hp)
10340 kPa (103.4 bar) (1500 psi)
Impeller Conditioner
540 rpm
41-56 kW (55-75 hp)
10340 kPa (103.4 bar) (1500 psi)
Platform OVERALL LENGTH (Transport)
5 02 m (16 ft 6 in )
[ Measured from center of hitch pin hole ]
OVERALL WIDTH
[ Includes tractor with 18 4 x 34 tires and 79 inch center-to-center wheel spacing ]
Transport
Cutting Width
SHIPPING WEIGHT
CUTTING HEIGHT
With Gauge Shoes Without Gauge Shoes
CONDITIONER
Type
Width
Diameter
Speed
Drive
Conditioner Hood
CUTTERBAR
Type
Number of Disks
Number of Knives
Knife Type
Knife Circle Diameter
Guard Angle
Oil Reservoir Capacity
WINDROW FORMATION
WINDROW WIDTH
[ Depending on crop conditions ]
TIRES
3 31 m (10 ft 10-3/8 in ) 2 5 m (8 ft 2 in ) 1681 kg (3705 lb)
34-161 mm (1-5/16- 6-15/16 in ) 28-97 mm (1-1/8-3-13/16 in )
Urethane rolls, with intermeshing, recessed cleats
1727 mm (68 in )
254 mm (10 in )
664 rpm
Direct gear N/A
Rotary disk 5 10 (2 per disk)
Reversible, interchangeable 61 5 cm (24-7/32 in )
3-Position
8 5 L (9 U S qt)
Forming shields and adjustable swathboard
762-1676 mm (30-66 in )
9 5L-14, 6 PR
5 02 m (16 ft 6 in )
3 31 m (10 ft 10-3/8 in ) 2 5 m (8 ft 2 in ) 1715 kg (3780 lb)
34-161 mm (1-5/16-6-15/16 in ) 28-97 mm (1-1/8-3-13/16 in )
Rotor impeller with, 49 V-tines
1727 mm (68 in )
594 mm (23-25/64 in )
[ With V-tines fully extended ]
620 or 871 rpm
Direct gear
Adjustable, one lever
Rotary disk 5 10 (2 per disk)
Reversible, interchangeable 61 5 cm (24-7/32 in )
3-Position
8 5 L (9 U S qt)
762-1676 mm (30-66 in )
9.5L-14, 6 PR
Mower-Conditioner Specifications
[ (Specifications and design subject
925 Mower-Conditioner Specifications
Roll Conditioner
TRACTOR REQUIREMENTS
Power Take-Off
Horsepower
540 rpm
1000 rpm
Hydraulic Pressure
OVERALL LENGTH (Transport)
[ Measured from center of hitch pin hole ]
OVERALL WIDTH
Transport
Cutting Width
SHIPPING WEIGHT
CUTTING HEIGHT
With Gauge Shoes Without Gauge Shoes
CONDITIONER
Type
Width
Diameter
Speed
Drive
Conditioner Hood
CUTTERBAR
Type
Number of Disks
Number of Knives
Knife Type
Knife Circle Diameter
Guard Angle
Oil Reservoir Capacity
WINDROW FORMATION
WINDROW WIDTH
Depending on crop conditions ]
TIRES
540 or 1000 rpm
48.5-55.9 kW (65-75 hp)
48 5-112 kW (65-150 hp)
14480 kPa (144 8 bar) (2100 psi)
5.5 m (17 ft 11 in.)
3 6 m (11 ft 8 in )
3 m (9 ft 9 in ) 1868 kg (4150 lb)
34-161 mm (1-5/16-6-15/16 in ) 28-97 mm (1-1/8-3-13/16 in.)
Urethane rolls, with intermeshing, recessed cleats
2235 mm (88 in )
254 mm (10 in )
664 rpm
Direct gear
N/A
Rotary disk
6 12 (2 per disk)
Reversible, interchangeable
61 5 cm (24-7/32 in )
Adjustable, mechanical turnbuckle or hydraulic cylinder
9 5 L (10 U S qt)
Forming shields, adjustable swathboard and tuck panels
914-2159 mm (35-85 in )
9 5L-14, 6 PR or 12 5L-15, 8 PR
Impeller Conditioner
540 or 1000 rpm
48.5-55.9 kW (65-75 hp)
48 5-112 kW (65-150 hp)
14480 kPa (144 8 bar) (2100 psi)
5.4 m (17 ft 7 in.)
3 6 m (11 ft 8 in )
3 m (9 ft 9 in )
1841 kg (4090 lb)
34-161 mm (1-5/1 6-6-15/16 in ) 28-97 mm (1-1/8-3-13/16 in.)
Rotor impeller with, 56 V-tines
2220 mm (87-1/2 in )
594 mm (23-25/64 in )
[ With V-tines fully extended ]
620 or 871 rpm
Direct gear
Adjustable, one lever
Rotary disk
6
12 (2 per disk)
Reversible, interchangeable
61 5 cm (24-7/32 in )
Adjustable, mechanical turnbuckle or hydraulic cylinder
9 5 L (10 U S qt)
914-2159 mm (35-85 in )
9 5L-14, 6 PR or 12 5L-15, 8 PR
Mower-Conditioner Specifications
[ (Specifications and design subject to change without notice ) ] -935
935 Mower-Conditioner Specifications
TRACTOR REQUIREMENTS
Power Take-Off
Horsepower
Hydraulic Pressure
OVERALL LENGTH (Transport)
[ Measured from center of hitch pin hole ]
OVERALL WIDTH
Transport
Cutting Width
SHIPPING WEIGHT
CUTTING HEIGHT
With Gauge Shoes Without Gauge Shoes
CONDITIONER
Type Width
Diameter Speed
Drive
Conditioner Hood
CUTTERBAR
Type
Number of Disks
Number of Knives
Knife Type
Knife Circle Diameter
Guard Angle
Oil Reservoir Capacity
WINDROW FORMATION
WINDROW WIDTH
[ Depending on crop conditions ]
TIRES
Roll Conditioner
1000 rpm
69-112 kW (90-150 hp)
13789 kPa (138 bar) (2000 psi)
5 5 m (17 ft 11 in )
4 m (13 ft 2 in )
3 5 m (11 ft 6 in ) 2070 kg (4600 lb)
34-161 mm (1-5/16-6-15/16 in ) 28-97 mm (1-1/8-3-13/16 in )
Urethane rolls, with intermeshing, recessed cleats
2692 mm (106 in )
254 mm (10 in )
664 rpm
Direct gear
N/A
Rotary diskRotary disk
7 7
14 (2 per disk)14 (2 per disk)
Reversible, interchangeableReversible, interchangeable 61 5 cm (24-7/32 in )61 5 cm (24-7/32 in )
Impeller Conditioner
1000 rpm
69-112 kW (90-150 hp)
13789 kPa (138 bar) (2000 psi)
5 4 m (17 ft 7 in )
4 m (13 ft 2 in )
3 5 m (11 ft 6 in ) 2043 kg (4540 lb)
34-161 mm (1-5/16-6-15/16 in ) 28-97 mm (1-1/8-3-13/16 in )
Rotor impeller with 70 V-tines
2680 mm (105-1/2 in ) 594 mm (23-25/64 in )
[ With V-tines fully extended ]
620 or 871 rpm
Direct gear
Adjustable, one lever
Adjustable, mechanical turnbuckleAdjustable, mechanical turnbuckle or hydraulic cylinderor hydraulic cylinder 10 4 L (11 U S qt)10 4 L (11 U S qt)
Forming shields, adjustable swathboard and tuck panels 1016-2540 mm (40-100 in )1016-2540 mm (40-100 in ) 9 5L-14, 6 PR or 12 5L-15, 8
Metric Bolt and Cap Screw Torque Values
Top, Property Class and Head Markings; Bottom, Property Class and Nut Markings
a "Lubricated" means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings.
b "Dry" means plain or zinc plated without any lubrication
Metric Bolt and Cap Screw Torque Values, 2 of 2
DO NOT use these values if a different torque value or tightening procedure is given for a specific application. Torque values listed are for general use only. Check tightness of fasteners periodically
Shear bolts are designed to fail under predetermined loads Always replace shear bolts with identical property class
Fasteners should be replaced with the same or higher property class If higher property class fasteners are used, these should only be tightened to the strength of the original Class 4 8Class 8 8 or 9 8Class 10 9
Tighten plastic insert or crimped steel-type lock nuts to approximately 50 percent of the dry torque shown in the chart, applied to the nut, not to the bolt head Tighten toothed or serrated-type lock nuts to the full torque value Make sure fastener threads are clean and that you properly start thread engagement This will prevent them from failing when tightening
Unified Inch Bolt and Cap Screw Torque Values
Top, SAE Grade and Head Markings; Bottom, SAE Grade and Nut Markings
Unified Inch Bolt and Cap Screw Torque Values, 1 of 2
Grade 1 (No Mark)Grade 2 a (No Mark)Grade 5, 5.1 or 5.2Grade 8 or 8.2 b
a Grade 2 applies for hex cap screws (not hex bolts) up to 6 in (152 mm) long Grade 1 applies for hex cap screws over 6 in (152 mm) long, and for all other types of bolts and screws of any length.
b "Lubricated" means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings
c "Dry" means plain or zinc plated without any lubrication
Unified Inch Bolt and Cap Screw Torque Values, 2 of 2
DO NOT use these values if a different torque value or tightening procedure is given for a specific application Torque values listed are for general use only Check tightness of fasteners periodically
Make sure fastener threads are clean and that you properly start thread engagement This will prevent them from failing when tightening
Tighten plastic insert or crimped steel-type lock nuts to approximately 50 Shear bolts are designed to fail under predetermined loads Always replace shear bolts withpercent of the dry torque shown in the chart, applied to the nut, not to the identical grade bolt head Tighten toothed or serrated-type lock nuts to the full torque value
Fasteners should be replaced with the same or higher grade If higher grade fasteners are used, these should only be tightened to the strength of the original
Service Recommendations For O-Ring Boss Fittings
Straight Fitting
Angle Fitting
STRAIGHT FITTING
1.Inspect O-ring boss seat for dirt or defects.
2.Lubricate O-ring with petroleum jelly. Place electrical tape over threads to protect O-ring. Slide O-ring over tape and into O-ring groove of fitting Remove tape
3 Tighten fitting to torque value shown on chart
ANGLE FITTING
1 Back off lock nut (A) and backup washer (B) completely to head-end (C) of fitting
2 Turn fitting into threaded boss until backup washer (B) contacts base of boss
3 Turn fitting head-end (C) counterclockwise to proper index (maximum of one turn)
4.Hold fitting head-end (C) with a wrench and tighten lock nut (A) and backup washer (B) to proper torque value.
→NOTE:
Do not allow hoses to twist when tightening fittings.
O-Ring Boss Fitting Torque Table [ The torque values shown are based on lubricated fittings ]
