CHAPTER 6. SCMA54F,48F INSPECTION AND MAINTENANCE OF MAJOR PARTS

SCMA48,54

CAUTION:

・When servicing the lawn mower, place it on level, hard ground.

・ Stop the engine and remove the starter key.

・Apply the parking brake securely.

・Push down (d) the lift lever to lower the mower to the ground.

・Shift the PTO lever to the STOP position (N).

・Service the lawn mower after the engine has cooled down sufficiently.

With these items in mind,confirm the safety conditions for maintenance operation without failing ahead of time.

1. INSPECTION AND REPLACEMENT OF BEVEL GEAR CASE OIL

・Inspection of oil level in the bevel gear case a. Bevel gear case (LH) and (RH) : Remove the level plug located on the back side of the bevel gear case.

IMPORTANT: Check the oil level after every 50 hours of operation.

(1) Bevel Gear case (RH) (3) Oil filler plug

(2) Level plug b. Check to see if a small amount of oil overflows through the plug hole. If so, the level is normal. If not, replenish with gear oil SAE80 through the filler hole using an oil pitcher or the like.

Gear oil SAE 80

SCMA48F LH0.5 L

RH0.35 L

SCMA54F LH0.8 L RH0.35 L

IMPORTANT: Before reassembling the level plug, be sure to wrap the threads with sealing tape without fail, or oil may leak through the plug.

・Replacement of oil a. Remove the level plug and oil filler plug. Then drain all the oil by tilting the gear case.

IMPORTANT: Replace oil after the initial 50 hours of operation and then after every 200 hours of operation.

(1) Bevel Gear case (LH) (3) Oil filler plug

(2) b. Wrap the threads of both plugs with sealing tape and pour new oil using an oil pitcher. c. Make sure that the oil leaks through the level plug. Then screw both plugs in.

2. INSPECTION & REPLACEMENT OF BLADES

・Inspection of blades and phase position LH & RH.

DANGER:

・ Don’t touch the blade. Before handling the blade, put on gloves.

・Inspection of blades a. Turn the mower deck upside down. b. Check the mower blades for deformation and damage.

CAUTION: When turning the mower deck upside down, take care not to allow it to hit your feet.

IMPORTANT:

(1) Blade (LH) (2) Blade (RH) a. Confirm that blade LH(1) and blade RH(2) are at right angles to each other. b. When these blades are not at right angles to each other, straighten them by following ways.

・ If the blade ends have become round due to wear, enlarged clearance between blades leave uncut grass behind. The blade should be checked timely and worn ones should be replaced immediately a. New Blade b. Blade with rounded edge c. Exessively worn blades are very dangerous. So replace such blades with new ones at once. c. The blade nuts should be tightened to the specified torque with the blades chocked respectively.

・Low cutting height or the operation just after soil has been applied will wear blades rapidly. The blades should be checked more frequently.

(1) Bolt (M12) (3) Plate (5) Blade

(2) Spring washer (4) Shims (1.2) (6) Collar (blade)

1. Remove one of both bolts(1) of the blades(5).

2. Remove the collar(6) assembly.

3. Install the collar(6) assembly so that blade LH(1) and blade RH(2) are at right angles to each other.

4. Fix wood between blade and mower deck to tighten the bolt(1)

Tightening torque: 1000kgf・cm (72ft.lb)

5. After installing the blade, be sure to confirm that it has no trouble by turning the blade with hand.

Tightening torque:1000kg・cm (72 ft・lb) d. There are two kinds of blades for respective mower decks. Be sure to install the blades in the proper positions.

DANGER: Be sure to use new bolts when changing blades.

IMPORTANT: Make sure that the blades are not in contact with the mower deck by turning them by hand.

4. INSPECTION OF ROLLERS

Make sure that the roller turns smoothly.

e. Connect the mower deck to the lawn mower properly, referring to the paragraph for “attaching and detaching the mower deck” at page 89.

3.

As the gauge wheels and rollers are installed on the front and rear ends of the mower, they are vulnerable to being hit and deformed by obstacles. When a wheel or roller does not turn smoothly or is deformed, replace it with a new one immediately.

(1) Roller

IMPORTANT:

・When the wheels and rollers are hard to turn, disassemble them and clean them.

・After re-assembly, be sure to grease them sufficiently:

5. CLEANING OF MOWER DECK

a. After mowing, clear the underside of the mower deck and blades from accumulated grass and dirt. Especially after operation in wet grass, wash them without failing, otherwise accumulated wet grass and dirt will cause performance deterioration.

CAUTION: When pouring the water onto the mower deck to clean, be sure to make revolution of engine low.