TM 9-2510-247-13&P
MAIN VALVE ASSEMBLY MAINTENANCE
REMOVAL, REPAIR, INSTALLATION
INITIAL SETUP:
Equipment Conditions
Materials/Parts
Washer, lock (2) (12387272-45)
Tools/Test Equipment
Tool Kit, Mechanics General,
Eighteen preformed packings
Tool Kit, Common No. 1
Personnel Required: 3
General Safety Instructions
Have a suitable container available to catch
spilled hydraulic fluid.
REMOVAL
WARNING
High pressure is present in the 250M Fifth Wheel Towing Device hydraulic
system. Do not disconnect any hydraulic system component unless
hydraulic system pressure has been relieved. Ensure each hydraulic control
lever is moved several times through all positions and hydraulic tank relief
valve is slowly loosened to relieve pressure. Faiure to comply may result in
severe injury or death to personnel.
Spilled hydraulic oil is very slippery. Be careful when entering or working in
area. Wipe up any spilled oil immediately. Failure to comply may result in
severe injury or death to personnel.
CAUTION
Always clean around fittings before disconnecting or connecting hoses or
fittings. Ensure area is clean before installing hydraulic components.
Failure to comply may result in damage to equipment.
Cover, cap, or plug all openings, ports, and tube or hose ends when they are
disconnected. Failure to comply may result in damage to equipment.
Fittings must be installed and hand-tightened. If a fitting cannot be handtightened,
it may be cross-threaded or have damaged threads. Use wrench
only for final tightening. Failure to comply may result in damage to
equipment.
Do not use Teflon tape as a sealer on any fittings. It can separate from the
fittings and cause control valves, relief valves, and actuators to become
contaminated and fail.
Do not apply sealant to the first threads of NPT fittings. If sealant enters the
hydraulic system, it may cause components to fail.
0059 00-1