Hydraulic Pump - TM-5-2410-233-340106

other reason, the pump may seize or otherwise be

(2) Cleaning. Clean all parts with cleaning

damaged when the engine is started.

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

(3) The pump assembly consists of a small

free cloth. Clear all passages in tilt control valve of

section pump and a large section pump, utilizing a

restrictions with filtered compressed air.

common inlet, within the same pump assembly.

(3) Inspection and repair.

(4) The large section of the pump provides

(a) Inspect springs for weak or damaged

hydraulic power for the blade lift circuit, which is

condition and free movement of valves in bores.

controlled by a valve located within the hydraulic

Inspect valve seating surface and seat in bore for

tank and for the scraper circuit which is controlled

nicks, burrs, and proper contact. Examine edges of

by an external valve. The small pump section

valve land for damage and wear. Replace defective

powers the blade tilt circuit through a control valve

parts.

mounted in the tank.

(b) Inspect O-ring seals (7 and 8, fig. 4-

b. Removal. Refer to TM 5-2410-233-20 and

17) for cuts, breaks, or deterioration. Replace all

remove the hydraulic pump from the tractor.

defective packing.

c. Disassembly.

(4) Reassembly.

(1) When disassembling the oil pump, avoid

(a) Reassemble the tilt control valve using

introducing dirt or foreign material into the pump,

figure 4-17 as a guide.

(2) Before removing the small section cover,

(b) Install sufficient shims (20) to provide a

mark both section covers with match marks so the

relief valve opening pressure of 1,975 25 psi.

covers can be installed in the same position. This

(c) Be sure pilot valve seat (23) is bottomed

will insure the proper relationship between the inlet

square against the shoulder in control valve body

and outlet ports of the pumps.

(5) and spring is in its recess in seat (23).

(3) Small pump section.

(d) Torque bolts (9, fig. 4-17) to 25 1 ft-lb.

(5) Installation.

(a) Remove bolts (1, fig. 4-19) and cover

(2).

(a) Install tilt control valve in reverse of

(b) Remove O-ring seal (3), wave washer

removal.

(4), and cartridge (5).

(b) Torque bolts (1, fig. 4-16) to 60 2 ft-

CAUTION

lbs.

Vanes (11, fig. 4-20) and insert vanes

NOTE

(12) are free to slide out of the rotor and

Bolt (5) must be in place before installing manifold (3)

r i n g , and may be damaged if drop-

on plate (2).

peal.

4-7. Hydraulic Pump

a. General.

cartridge. Pump rotation is counterclockwise when

(1) The double section, insert vane-type

viewed from the drive spline end, Correct pump

hydraulic pump is bolted on the engine rear power

assembly requires that the leading chamfered edge

takeoff housing and is driven by the rear power

of vanes (11), arrow (6) on ring (5) and the arrow

takeoff idler gear.

on rotor (13) all point in the direction of pump

(2) The pump must have an adequate supply

rotation.

of clean oil, as it is dependent upon a continuous

CAUTION

flow of oil for lubrication of closely fitted parts. If

Tighten bolts (1) only after large sec-

inlet oil is not available to the pump because of low

tion cover bolts have been tightened.

oil level, clogged or leaking inlet lines, or for any

4-28