3-29. CLEANING HYDRAULIC SYSTEM
a. Removal of Contamimants (Sheet 1 of 3).
This task covers removal of contami-
nants from hydraulic system oil.
TOOLS: Fitting kit (FSCM 45225 PN CAS-10508)
Portable filter (FSCM 45225 PN CAS-10162A)
REFERENCES: TM 5-3805-262-20
If hydraulic system oil is contaminated
remove water from hydraulic system.
by water, go to page 3-757 to
If there is visible evidence of contamination (hydraulic system oil
contains air, contains particles of metal or dirt, is dark and thick, or
has the odor of burnt oil) or if there is evidence of microscopic
contamination of hydraulic system (cylinder rod seals leak, control
valve spools do not return to neutral position or resist movement,
hydraulic oil is excessively hot, hydraulic system components wear
rapidly or fail quickly after repair, or hydraulic system operation is
sluggish) remove contaminants as described below.
(1) If contamination is visible, drain and refill hydraulic reservoir (refer
to TM 5-3835-262-20). If contamination is microscopic, drain and refill
hydraulic reservoir only if scheduled (refer to PMCS table of TM 5-3805-
Remove and disassemble one hydraulic cylinder as-
sembly (page 3-722, page 3-737, or page 3-744) in
each of two different circuits. Check for damage
to seals, scoring of cylinder tub
damage. Repair as necessary. If d
be caused by severe contamination
normal wear, it is necessary to r
and repair all hydraulic system c
lines, and fittings.
(3) Prepare portable filter for opera
(a) Remove all hydraulic oil from in
hoses of portable filter.
(b) Remove filter element from porta
(c) Drain all hydraulic oil from por
(d) Clean inside surface of filter
(e) Install new filter element in