TM 9-2320-279-34-3
Hydraulic System Maintenance Instructions (Cont)
20-7. PRIMARY PUMP HYDRAULIC MOTOR CONTROL VALVE REPAIR (M978).
This task covers:
a. Disassembly
c. Assembly
b. Cleaning/Inspection
d. Follow-on Maintenance
INITIAL SETUP
Models
M978
Test Equipment
None
Special Tools
None
Supplies
Solvent, dry cleaning, Item 57, Appendix C
Oil, lubricating, Item 47, Appendix C
Personnel Required
MOS 63W, Wheel vehicle repairer
References
None
Equipment Condition
TM or Para
Condition Description
Primary pump hydraulic
motor control valve on clean
work surface.
Special Environmental Conditions
None
General Safety Instructions
None
Level of Maintenance
Direct Support
a. Disassembly.
CAUTION
Do not attempt to remove
relief valve first. Damage to
end cap will occur.
(1) Remove four screws (1) and
end cap (2).
(2) Remove relief valve
assembly (3).
(3) Remove preformed
packing (4), two rings (5),
and preformed packing (6)
from relief valve
assembly (3).
(4) Remove plug (7) and
preformed packing (8) from
valve housing (9).
20-20
