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TM 5-4210-220-12
4-25. STEERING SYSTEM - Continued
(3)
Inspect valve cover bore. If scratched or otherwise damaged, replace the valve cover. Do not attempt to
repair.
NOTE
During handling and shipping of new relief valve, burrs may be raised on sharp edges. Be
sure to remove these burrs before installing relief valve.
(4)
Coat the new relief valve with lubricating oil (item 17, Appendix E) and install it in the valve cover, small
land first.
(5)
Check the valve slides smoothly in the valve bore and install spring (4).
(6)
Apply pipe sealant (item 22, Appendix E) to plugs (1) and (3) and install in valve cover.
c.
Pump Cartridge Repair
NOTE
Pump must be removed from truck. See REMOVAL preceding.
(1)
Remove cover screws (1). Note position of cover ports with respect to body port and lift off cover (2)
and O-ring (6).
(2)
Remove pressure plate (4) and spring (3).
(3)
Note position of ring (7) with respect to body (12). Also note the direction of the arrow on the ring. Lift
ring free of pump body (12). Remove and discard gasket (10).
(4)
Remove vanes (9) from rotor and pull rotor (8) off pump shaft.
(5)
Remove pressure relief valve from valve cover (see b. preceding).
WARNING
Dry cleaning solvent P-D-680 (safety or Stoddard's solvent) is potentially dangerous. Avoid
repeated and prolonged breathing of vapors and skin contact with the liquid. Do not use near
open flame, arcing equipment or other ignition sources. Always wear eye protection and
protective clothing. The flash point of P-D-680 is 100 to 138 deg. F (30 to 59 deg. C).
Death or serious injury could occur if compressed air is directed against the skin. Do
not use compressed air for cleaning or drying unless the pressure is/has been reduced
to 30 psi (2.11 kg/cm2) or less. When working with compressed air, always use chip
guards, eye protection, and other personal protective equipment.
(6)
Using dry cleaning solvent (item 10 Appendix E), wash all parts thoroughly and blow dry using
compressed air.
(7)
Inspect rotor (8) and vanes (9). Replace both if excessive play is noticed between vanes and slots in rotor.
4-479
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