Hydraulic Power Generating System

Manual Control Valve

B-1 Manual Control Valve

[NOTICE]

There is a case that the appearance and so on differ from the parts for this machine. Although there is not so much difference in functions and disassembly procedures, make sure of the serial number of this machine and the part sales unit described in the parts catalog before starting disassembling operations.

1. Structure

Thread size and tightening torque

Cross section

Manual Control Valve

Unloading valve

AA

Boom telescoping

Winch

Boom elevation

Swing

Jack 2

Jack 1

IW113-003002

Boom telescoping

Manual Control Valve

Manual Control Valve

Rotary Joint

B-2 Rotary Joint [NOTE]

There is a case that the appearance and so on differ from the parts for this machine. Although there is not so much difference in functions and disassembly procedures, make sure of the serial number of this machine and the part sales unit described in the parts catalog before starting disassembling operations.

1. Structure

General View

Rotary Joint

2.

Caution

When disassembling and reassembling, also observe ìgeneral cautions (hydraulic units)î in chapter A to work correctly.

Thread size and tightening torque

B-3 Hydraulic Pump [NOTICE]

There is a case that the appearance and so on differ from the parts for this machine. Although there is not so much difference in functions and disassembly procedures, make sure of the serial number of this machine and the part sales unit described in the parts catalog before starting disassembling operations.

1. Structure

Thread size and tightening torque

2. Dismounting and remounting

[NOTE]

When replacing the pump, pay attention to the rotating direction of the new pump. (The rotating direction as viewed from the shaft end is stamped on the rear cover.)

3. Disassembly and reassembly

Caution

Disassemble only the parts specified to do so, leaving all others intact. Maintain the present position of the bearings and the gears in the body. Removing the gears from the body could make the pump unusable, even if the parts can be reassembled.

The covers, body and the bearings are made of aluminum alloy. Handle them carefully to avoid damage.

Remove oil thoroughly from the mating surfaces of the covers, body, etc.

3.1 Replacement of oil seal-2

1. Unscrew bolts-7, and remove front cover-9.

2. Remove retaining ring-1 from front cover-9; remove oil seal-2.

3. Install new oil seal-2, and install retaining ring-1.

4. Pack grease (LIMAX 3 or equivalent), between the lips of oil seal-2.

5. With the spline of drive gear-8 wound with a tape to protect the lips of oil seal-2 from damage, install front cover-9, and tighten bolts-7.

3.2 Replacement of backup strip-13 and gasket-3,12

1. Front cover side

Unscrew bolts-7 and remove front cover-9. Remove backup strip-13 and gasket-3,12 from front cover-9.

Install new backup strip-13 and gasket-3,12 and assemble in the reverse sequence of disassembly.

2. Rear cover side

Follow the same procedure as for the front cover side.

4. Cautions for starting the pump

1. Before starting the pump,check the rotating direction of the pump, and the connection of the hydraulic lines. If the pump is driven in the wrong direction, the suction and delivery sides are reversed,possibly resulting in the protrusion of the oil seal and other damage to the pump.

2. Before starting the pump, fill the suction line with hydraulic oil. First inch the pump, and then run it at a low speed and without load until all air is expelled from the hydraulic lines. Avoid running the pump at high speeds and/or under heavy load from the beginning.

3. After allowing a sufficient brake-in time, check for leakage, vibration, excentricity of the shaft, change in oil temperature,etc., before gradually increasing the speed and the load up to the full power operation.