Section III. GENERAL MAINTENANCE - TM-10-3930-620-340015

Malfunction

Probable Cause

Corrective Action

17. Hoist cylinder packing leaks.

Worn packings or piston scored.

Inspect and repair cylinder (para

3-19 and 3-20).

18. Hoist ,or tilt cylinder lowers or

a. Worn packing in lift cylinder or tilt

a. Inspect and repair cylinder (para

tilts while truck is idle.

cylinder.

3-18, 3-19 and 3-20).

b. Defective control valve.

b. Inspect and repair control valve

(para 3-22).

19. Mast will not tilt.

a. Defective hydraulic pump.

a. Inspect and repair hydraulic pump

(para 3-24).

b. Defective control valve.

b. Inspect and repair control valve

(para 3-22).

c. Defective tilt cylinder.

c. Overhaul tilt cylinder (para 3-18).

Section III. GENERAL MAINTENANCE

2-4. General

manner. Failure to do so might cause personal

Testing and servicing of mechanical, hydraulic and

injury due to electrical shock or accidental

electrical units and assemblies are covered in their

movement of the truck.

respective sections of this manual. Paragraph 2-5

When performing any maintenance on the lift truck

contains the shutdown procedure that is related to many

requiring a shutdown of power, proceed as follows:

areas of maintenance.

a. Disconnect battery connector.

2-5. Shutting Down Power for Maintenance

b. Turn the keyswitch on for a few seconds. This

Warning: Be sure that power is always shut

allows the' capacitors in the capacitor and diode

assembly to discharge into the control system circuitry.

down for maintenance purposes in the following

c. Turn off the keyswitch and remove the key.

Section IV. REMOVAL AND INSTALLATION OF MAJOR COMPONENTS AND AUXILIARIES

2-6. General

2-7. Power Switch Assembly

a. Removal.

This section contains detailed instructions for removal

and installation of assemblies and auxiliaries within the

(1) Disconnect

battery

and

discharge

fork lift truck.

Each major assembly is covered

capacitors (para 2-5).

individually, with its component subassemblies, as a

(2) Open the power switch cover (TM 10-

related series of instructions.

In many cases a

3930-620-12).

subassembly can be removed without removing or

(3) Remove the power switch assembly

dismantling the major assembly. In this case, select

according to figure 2-2.

b. Installation.

only the applicable steps from the complete instructions

for servicing the next higher assembly. Always tag or in

(1) Install the power switch assembly

some other manner identify such parts as hoses and

according to the reverse of figure 2-2.

wiring leads to facilitate reassembly. When possible,

(2) Close the power switch cover (TM 10-

replace attaching parts such as nuts, bolts, flatwashers,

3930-620-12 ).

lockwashers and clamps on the part they attach. This

(3) Reconnect battery connector.

should prevent loss or misplacement.

2-4