Inspection and Repair. - TM-5-2410-233-340120

packing properly when retainer is tightened into

place.

CAUTION

When installing the head on the rod, be

careful not to damage the packing.

(7) Install new backup ring (3. fig. 4-38) and

preformed packing (2).

(8) Assemble wear ring (8) on piston (1), and

install piston on the rod.

(9) Install the nut securing the piston to the

rod, and tighten per nut and bolt torque chart in

table 1-2.

(10) Install seal assemblies (7) to the piston

(1). Refer to paragraph 4-8 f (14 through 20) for

installation procedures.

NOTE

Point "B" (fig. 4-33) will be at the 8.25 inch mark on

the expander assembly for this cylinder.

g. Packing Adjustment. Hydraulic cylinder

packing leakage can be caused by wear, cuts,

and/or distortion of the packing. If the cylinder

leaks around the rod, shims can be removed to

e. Inspection and Repair.

tighten the packing around the rod.

(1) Inspect the cylinder for scoring, pitting,

(1) Lower the bulldozer blade to the ground.

and wear. Replace a cylinder which cannot be

(2) Remove the bolts holding retainer (1, fig.

made serviceable with light honing.

4-40) to cylinder head.

CAUTION

(3) Pry on tap the retainer out far enough to

Do not weld on the cylinder assembly as

permit cutting and removing shims (2).

scoring may result from t h e bore

(4) Remove one shim at a time. If, after

shrinkage.

removing two shims the cylinder still leaks, replace

(2) Replace all seals, packing, and wear rings.

the packing.

(3) Inspect the rod end bearing for scoring,

damage, and wear. Replace as required.

(4) Inspect the piston rod for nicks, burrs,

pitting, distortion, and wear. Repair or replace a

damaged or distorted rod. Remove minor nicks and

burrs using a fine emery stone. Pitted, scored, or

worn rods may be repaired by metalizing or

chrome-plating and regrinding to original size. A

non-corrosive metal will be used to metalize shafts.

f. Reassembly.

(1) Place retainer (6) packing rings (9) and

head (4) on the piston rod.

(2) Separate and oil all of the rings in packing

(9). Install one ring of packing at a time into head

(4) so the open part of the V is facing toward head.

Be sure rubber pressure ring (11) is located as

shown.

(3) Using retainer (6), tap the packing firmly

into place in the head.

(4) While holding retainer firmly seated

against packing, measure clearance (B, fig. 4-39)

between retainer and head with a thickness gage.

(5) Remove the head with the packing from

the piston rod, leaving the retainer on the rod.

(6) Install shims on the rod with a total

thickness of 0.010 inch to 0.01.5 inch less than the

measured clearance (B). This will preload the

4-42