Section III. HYDRAULIC CYLINDERS

(5) Pump shaft removal. Refer to figure 4-23

d. Cleaning. Clean all parts with cleaning solvent

and remove the shaft, seal and bearing.

(Fed. Spec. P-D-680). Dry parts with a lint free

cloth. Clear all passages in hydraulic pump of

restrictions with filtered compressed air.

e. Inspection and Repair.

(1) Inspect the pump bearings for scoring,

damage, and wear. Replace bearings which are

scored, damaged or worn excessively.

(2) Inspect the plates, ring, rotor, and vanes

for damage and wear. Install cartridge kits if parts

are found damaged or worn excessively.

(3) Inspect pump housing for cracks, breaks,

and other damage. Replace defective parts.

(4) Install new seals, washers, and packing.

f. Reassembly.

(1) Reverse disassembly procedure and

assemble the hydraulic pump. During assembly,

immerse each pump part in clean hydraulic oil.

(2) Pump rotation is counterclockwise when

viewed from the drive spline end. Be sure that the

leading chamfered edge of the vanes, arrow on the

ring, and arrow on the rotor, all point in the

direction of pump rotation.

(3) Tighten bolts to torque valve given in table

1-2.

g. Installation. Refer to TM 5-2410-233-20 and

install the hydraulic pump on the tractor.

Figure 4-23. Shaft, seal, and bearing removal.

Section Ill. HYDRAULIC CYLINDERS

4-8. Hydraulic Lift Cylinders

(4) Retract piston rod (1) and wire the rod end

to the head of the cylinder. Remove the cylinder

a. General. Both blade lift cylinders are removed

with the rod in the retracted position.

and installed in a similar manner. The hydraulic

(5) Attach a hoist to the cylinder (3, fig. 4-25).

system need not be drained to remove cylinders;

(6) Disconnect the hydraulic oil lines (1) and

however, do not move the control lever from neutral

mark them in relation to their openings to assure

position after disconnecting cylinder oil lines.

proper connections when installing the cylinder (3).

b. Removal.

(7) Cover all openings to prevent the entry of

(1) Lower the bulldozer blade to the ground.

dirt into the hydraulic system.

(2) Remove bolt (3, fig. 4-24) securing lockpin

(8) Remove bolts (2) and trunnion caps (4),

(2) to the bulldozer blade bracket.

and lift clinder (3) away from the tractor.

(3) Remove pin (4) securing piston rod (1) to

the bulldozer blade.

4-33