TM 9-2320-279-34-3
CHAPTER 20
HYDRAULIC SYSTEM MAINTENANCE
Contents
Para
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-1
Hydraulic Hand Pump Repair (M983). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-2
Winch/AuxiliaryHydraulic Relief Valve Repair (M983, M984) . . . . . . . . . . . . . . . . . . . . . . . . 20-3
Self-Recovery Winch Control Valve Assembly Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-4
Heavy-Duty Selector Valve Repair (M984) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-5
Ancillary Equipment Engine Idle Speed Adjustment (M984) . . . . . . . . . . . . . . . . . . . . . . . . . . 20-6
Primary Pump Hydraulic Motor Control Valve Repair (M978) . . . . . . . . . . . . . . . . . . . . . . . . . 20-7
Heavy-DutyWinch Manifold Removal/Installation (M984E1) . . . . . . . . . . . . . . . . . . . . . . . . . 20-8
Heavy-Duty Winch Manifold Repair (M984E1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-9
Retriever Control Valve Repair (M984E1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-10
Page
20-1
20-1
20-5
20-7
20-10
20-17
20-20
20-23
20-26
20-37
Section I.
INTRODUCTION
20-1. GENERAL. This chapter contains maintenance instructions for repair of the hydraulic system at
the direct support level.
Section Il.
HYDRAULIC HAND PUMP
Hydraulic System Maintenance Instructions
20-2. HYDRAULIC HAND PUMP REPAIR (M983).
This task covers:
a. Disassembly
c. Assembly
b. Cleaning/Inspection
d. Follow-on Maintenance
INITIAL SETUP
Models
References
M983
None
Test Equipment
Equipment Condition
None
TM or Para
Condition Description
Special Tools
Hydraulic hand pump on
None
clean work surface.
Fabricated Tools
Special Environmental Conditions
Seal retainer tool, Item 7, Appendix B
None
Valve seat tool, Item 6, Appendix B
General Safety Instructions
Supplies
None
Solvent, dry cleaning, Item 57, Appendix C
Level of Maintenance
Personnel Required
Direct Support
MOS 63W, Wheel vehicle repairer
20-1
