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POWER STEERING SYSTEM MAINTENANCE.
Up
TM-5-4210-224-14-P 250 6PM Mini-Pumper Firefighting Truck Model No.:CM-KFT-3 Manual
Next
Power Steering Analyzer
TM 5-4210-224-14 & P
4-226. POWER STEERING SYSTEM MAINTENANCE. (Continued)
CAUTION
(i) Stop the engine.  Check the fluid
Do not leave valve fully closed for
level and refill as required.
more than 5 seconds as the pump
(j) If the fluid is extremely foamy, allow
could be damaged internally.
the vehicle to stand a few minutes
and repeat the above procedure.
(7) Close the gate valve fully 3 times.
(5) Insert thermometer in the reservoir filler
Record the highest pressures attained
(4) opening.  Move the steering wheel
each time.
from stop to stop several times until the
thermometer indicates that the hydraulic
fluid in the reservoir has reached a
NOTE
temperature of 150 to 170 F (65 to
If the pressures recorded are within
77 C).
the range of 1350-1450 psi (9308-
9998
kPa)
minimum
and
maximum,  and  the  range  of
NOTE
readings is within 50 psi (345 kPa),
To prevent scrubbing flat spots on
the pump is functioning within its
the tires, do not turn the steering
specifications.
wheel more than five times without
rolling the vehicle to change the
If the pressures recorded are high,
tire-to-floor contact area.
but do not repeat within 50 psi (345
kPa), the flow controlling valve is
(6) Start the engine and check the pump fluid
sticking. Remove the valve, clean
level. Add power steering fluid if required.
it and remove any burrs using
When the engine is at normal operating
crocus cloth (Appendix D, Item 10)
temperature, the initial pressure reading
or fine hone.
If the system
on the gauge (valve open) should be in
contains some dirt, flush it. If it is
the 80125 psi (550-860 kPA) range.
exceptionally dirty, both the pump
Should this pressure be in excess of 200
and  gear  must  be  completely
psi (1380 kPA) check the hoses for
disassembled,  cleaned,  flushed
restrictions and the poppet valve for
and reassembled before further
proper assembly.
usage, or the pump must be
replaced.
4-315

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