TM 9-2350-256-20
CHAPTER 12
MAINTENANCE OF MAIN HYDRAULIC SYSTEM
CHAPTER OVERVIEW
This chapter covers the removal, disassembly, assembly, and installation of the main hydraulic system.
This chapter consists of the following paragraphs:
Para.
Task
Page
12-1
Replace Mechanical Transmission and Hydraulic Pump Hydraulic Lines and Fittings ....................... 12-1
12-2
Replace Hydraulic Lines and Fittings ............................................................................................... 12-7
12-3
Replace Hydraulic Connecting Panel ............................................................................................. 12-26
12-4
Replace Fuel Transfer Pump and Flow Regulator........................................................................... 12-28
12-5
Replace/Repair Hydraulic System Oil ............................................................................................ 12-31
12-6
Replace External Hydraulic Reservoir Components........................................................................ 12-33
12-7
Replace Hydraulic Drain Valve and Related Parts .......................................................................... 12-35
12-8
Replace Hydraulic Subplate Identification (ID) Plate....................................................................... 12-35
12-9
Replace Hydraulic Oil Reservoir Strainer........................................................................................ 12-36
12-10
Replace/Repair Oil Temperature Transmitter and Switch Housing Assembly.................................. 12-37
12-11
Replace Mechanical Transmission ID Plate .................................................................................... 12-38
12-12
Replace/Repair Mechanical Transmission Breather and Oil Level Gage......................................... 12-39
12-13
Replace Spade Release and Lubrication Line (Hydraulic Spade Release) ...................................... 12-40
12-14
Replace Spade Cable Lubrication Line (Manual Spade Release).................................................... 12-41
12-15
Replace Spade Release Lubrication Fitting .................................................................................... 12-42
12-16
Replace Spade Cylinder Hoses .......................................................................................................12-43
WARNING
Do not attempt to loosen or tighten hydraulic fittings or lines when the system is pressurized. Ensure
that the boom is in the stowed position before doing any maintenance on the hydraulic system.
NOTE
Individual hydraulic lines and fittings may be removed and replaced separately as required. Each
line is marked with a part number and code number alternately at 36-inch (in.) (914-millimeter [mm]
intervals along its length. Foldout FO-1 (at the end of this manual) provides a schematic of hydraulic
lines and fittings.
12-1 REPLACE MECHANICAL TRANSMISSION AND HYDRAULIC PUMP
HYDRAULIC LINES AND FITTINGS
THIS TASK COVERS
a. Removal
b. Installation
INITIAL SET-UP
Tools:
Material:
Tool kit, general mechanic's (Appendix C, item 53)
Sealant tape (Appendix D, item 29)
12-1
