CHAPTER 3 REPAIR OF HYDRAULIC SYSTEM

TM 10-3930-630-34

CHAPTER 3

REPAIR OF HYDRAULIC SYSTEM

Section I. TILT CYLINDER

b. Inspect cylinder tube bore for scoring or

3-1. Description

nicks. Remove nicks and scratches with fine emery

cloth.

Tilt cylinders are connected to the outer mast and to the

c. Check piston sliding surface for scoring, nicks

frame below the toe plate. Hydraulic pressure applied on

or other damage. If damage is severe replace piston

either side of the cylinder rod will extend or retract the

assembly. Minor scratches or nicks can be removed with

rod. As the rod extends it tilts the mast forward. As the

fine emery cloth.

rod is retracted the mast tilts backward. Refer to figure

d. Check bore of gland nut and mating surfaces

3-1 for the hydraulic system schematic.

of plunger for damage which could cause faulty seating,

leaks or damage to other parts.

3-2. Tilt Cylinder, Removal and Disassembly

e. Check all parts for cracks, bends,

deformation, stripped threads, and other damage.

a. Removal. Refer to TMI 10-3930-630-12 and

f. Replace all packings, wiper rings and

remove the tilt cylinder.

damaged mating or sliding surface parts.

b. Disassembly. Disassemble the tilt cylinder in

numerical sequence as illustrated on figure 3-2.

3-4. Tilt Cylinder, Reassembly and Installation

NOTE

a. Reassembly. Reassemble the tilt cylinder in

The piston assembly (16) cannot be

the reverse of numerical sequence as illustrated in

separated from the plunger rod and

figure 3-2.

the two must be removed as an

b. Installation. Refer to TM 10-3930-630-12 and

assembly.

install and adjust the tilt cylinder and bleed the hydraulic

system.

3-3. Tilt Cylinder Cleaning, Inspection and Repair

a. Clean all metal parts in cleaning solvent (Fed.

Spec. P-D-680). Dry thoroughly with dry compressed air.

3-1