Section VI. HYDRAULIC LIFT SYSTEM MAINTENANCE

TM 10-3930-638-24&P

Section VI. HYDRAULIC LIFT SYSTEM MAINTENANCE

This section contains the information you'll need to maintain the:

Control valve

Hydraulic cylinders

Mast and carriage assembly

It gives you instructions on how to troubleshoot problems and repair or

replace the components that are within the scope of direct support

maintenance.

Para

Rotation Cylinder Assembly . . . . . . . . . . . . . 3-30d

Troubleshooting Index . . . . . . . . . . . . . . . . . . . 3-28

Lift Cylinder Assembly . . . . . . . . . . . . . . . . . 3-30e

Hydraulic Lift System Troubleshooting . . . . . . . . 3-29

Mast Assembly Maintenance. . . . . . . . . . . . . . . . 3-31

Hydraulic Lift System Maintenance . . . . . . . . . . . 3-30

Carriage Assembly . . . . . . . . . . . . . . . . . . . . 3-31a

Control Valve . . . . . . . . . . . . . . . . . . . . . . . 3-30a

Side Shifter Frame and Rotation Bearing . . . . . 3-31b

Tilt Cylinder Assemblies . . . . . . . . . . . . . . . . 3-30b

Inner and Outer Mast . . . . . . . . . . . . . . . . . . 3-31c

Sideshift Cylinder Assembly . . . . . . . . . . . . . 3-30c

3-28. TROUBLESHOOTING SYMPTOM INDEX

Para/Malfunction Page

HYDRAULIC LIFT SYSTEM

3-29/1

3-194

Unable to lift a load (all other functions normal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-197

3-29/2

Load drifts down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-197

3-29/3

Unable to sideshift load (all other functions normal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-198

3-29/4

Sideshift cylinder assembly operation sluggish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-199

3-29/5

Unable to tilt load (another functions normal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-201

3-29/6

Tilt cylinder assemblies operation sluggish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-201

3-29/7

Unable to rotate load (another functions normal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-202

3-29/8

Rotation operation sluggish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-29. HYDRAULIC LIFT SYSTEM TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. UNABLE TO LIFT A LOAD (ALL OTHER FUNCTIONS NORMAL)

NOTE

After completion of each check, lower forks until resting on ground.

Then, turn engine off.

3-194