Removal. - TM-5-2410-233-340098

shims determines the pressure at which the relief

valve opens (1,975 25 psi).

(4) Remove spring (11) and pilot valve (12).

Use a small magnetized rod to remove the pilot

valve.

NOTE

The seat (15) for pilot valve (12) is a press fit in body

(14). If replacement is necessary, remove plug

assembly (17) and press the seat downward, removing

it through the opening for the plug assembly. Chill the

replacement seat before installing it in body (14).

(5) Remove bolts (1) and cover (2). Use a -

inch-20 (NC) eyebolt to remove plug (4) beneath

cover (2).

(6) Partially remove bolts (19) securing cover

(18) to dump valve body (5).

(7) Insert a inch diameter rod 10 inches

long into the plug opening until the rod contacts

dump valve (23). Push against rod, compressing

spring (22), until dump valve contacts plug (20).

Tap on end of rod, forcing plug (20) out of body

(5).

(8) Remove bolts (19), cover (18), plug (20),

spring (22), and dump valve (23).

d. Cleaning. Clean all parts with cleaning solvent

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

Relief valve assembly

cloth. Clear all passages in relief valve of restric-

Manifold

Bolts

tions with filtered compressed air.

Bolts

e. Inspection and Repair.

Figure 4-13. Bulldozer relief valve removal.

(1) Inspect springs for weak or damaged

condition and free movement of valves in the bores.

b. Removal.

Inspect valve seating surface and seats in body for

(1) Remove the hydraulic tank from the

nicks, burrs, and proper contact, Replace defective

tractor (para 4-2).

parts.

(2) Remove the blade tilt control valve,

(2) Inspect preformed packing (16, fig. 4-14)

mounting plate and manifold (2) (para 4-2).

for cuts, breaks or deterioration. Replace all

(3) Remove bolts (3) and (4).

defective packing.

NOTE

f. Reassembly.

Bolts (3) secure the relief valve discharge tube (on

inside of tank) to the tank bottom plate.

(1) Reassemble relief valve using figure 4-14

as a guide.

c. Disassembly.

(2) Torque bolts (13) to 24 2 ft-lbs.

(1) Remove bolts and lockwashers (6, fig. 4-

(3) Install sufficient shims (10) to provide a

14) and cover (7).

relief valve opening pressure of 1,975 25 psi.

(2) Remove bolts and lockwashers (13) to

g. Installation. Install relief valve in reverse of

remove pilot valve body (14).

removal. Torque bolts (3) figure 4-13, to 43 2 ft-

(3) Remove shims (10) from between cover

lbs. and bolts (4) to 60 2 ft-lbs.

(7) and spring (11). The total thickness of the

4-20