REPAIR OF HYDRAULIC SYSTEM
Section I. TILT CYLINDER
b. Inspect cylinder tube bore for scoring or
nicks. Remove nicks and scratches with fine emery
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
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
the two must be removed as an
b. Installation. Refer to TM 10-3930-630-12 and
install and adjust the tilt cylinder and bleed the hydraulic
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.