Hydraulic Tilt Cylinder

CAUTION

Extend the piston rod (2) out of the

cylinder before removing bolts (3). This

w i l l prevent possible scoring of the

cylinder walls when r e m o v i n g the

piston from the cylinder.

(3) Remove the head, piston rod and piston.

(4) Inspect bearing (4) and mating pin.

(5) Remove retaining ring and pin securing

nut (1, fig. 4-37) to the piston rod (2).

(6) Remove nut (1) with a wrench as shown.

NOTE

When removing or installing nut (1) secure piston rod

(2) with a wrench on flats A.

(7) Remove piston (1, fig. 4-38).

(8) Remove wear ring (8).

(9) Expand the outer ring of seal assemblies

(7) and remove the outer and inner rings.

(10) Remove preformed packing (2) and

backup ring (3).

(11) Remove head (4).

(12) Remove bolts (5) securing retainer (6) to

head (4).

1 Slims

(13) Remove packing rings (9) and seal (10).

2 Retainer

(14) Inspect all parts, replacing worn or

Figure 4-34. Removing shims.

dam aged parts.

h. Installation. Reverse removal procedure and

(15) Remove marks or rough spots on the

install the hydraulic cylinders on the tractor.

piston rod with crocus or fine emery cloth to

4-9. Hydraulic Tilt Cylinder

prevent seal and packing damage.

(16) Inspect walls of cylinder bore for scoring

a. General. The hydraulic system need not be

marks. Any scoring m a r k s which cannot be

drained to remove the tilt cylinder, however, do not

removed with a minimum of light honing will

move the bulldozer tilt control lever from the

require replacement of cylinder assembly.

HOLD position after disconnecting the cylinder oil

CAUTION

lines.

U n d e r n o circumstances

should

b. Removal.

welding be done on cylinder. Welding

(1) Lower the bulldozer blade to the ground

on c y l i n d e r may cause e n o u g h

and remove the cylinder oil line guard.

shrinkage to cause interference between

(2) Attach a hoist to cylinder (1, fig. 4-35) and

piston and cylinder wall and result in

remove the bolts (2) securing cap (3) to the blade.

severe scoring of cylinder walls and

(3) Disconnect cylinder oil lines (5). Cover the

piston.

openings in the oil lines and cylinder to prevent dirt

d. Cleaning. Clean all parts with cleaning solvent

from entering system.

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

(4) Remove pin (6) and lift off the cylinder.

cloth.

c. Disassembly.

(1) Drain both ends of the cylinder.

(2) Remove bolts (3, fig. 4-36) securing the

head (1) to the cylinder.

4-39