GENERAL MAINTENANCE INFORMATION. (cont)
Hydraulic System Maintenance. (cont)
Cover large openings or ports with cardboard, sheets of plastic or masking tape.
Solvent burns easily and can give off harmful vapors. To avoid injury, keep away from open fire
and use in a well-ventilated area.
Clean up all spills and leaks with rags. When gasket is taken off, clean area with dry cleaning solvent P-
D-680 and rags.
Look at tube and hose nuts and fittings for bad threads. Replace bad nuts and fittings.
(10) Take protective caps or plugs off all tubes, lines, fittings, receptacles and connectors before they are
(11) Make sure connection points and insides of all tubes, lines and fittings are clean before installing them.
Sealing compound and solvent burn easily and can give off harmful vapors. To avoid injury, keep
away from open fire and use in a well-ventilated area.
(12) Before you put connection points together again, wipe off openings with solvent (P-D-680) and a clean
rag. If sealing compound was used around connection points, make sure it is removed.
(13) Put a light coat of lubricant, same as lubricant in system being worked on, on all preformed packings
before installing packing.
Lubricating oil (MIL-L-23699 or MIL-L-7808) can cause skin rash. If oil gets on skin or clothing,
wash with soap and water.
(14) Put lubricating oil on all threads, except pipe (tapered) threads, before you screw parts together.
(15) Always screw on and tighten tubes, hoses and fittings by hand to make sure that they are not
crossthreaded. Tighten with two wrenches whenever possible until you feel solid resistance, then tighten 1/4 turn more.