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 TM 55-1905-219-14-7
3 - 209.
HYDRAULIC CUB PUMP UNIT - HYDRAULIC RESERVOIR TANK AND
STRAINER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
INITIAL STARTUP (Cont)
Do not allow the pump to run at full speed for more than 30 seconds if it does not pick up
suction. If the pump does not pick up suction, it may be due to oil with too high a
viscosity, low oil level in the tank, a leak in the tank, or a leak in the suction line to-the
tank.
d. Prime the pump by turning the motor on and off several times in rapid succession.
e. Operate the hydraulic system and fill it will oil by moving rudder from hardover to hardover.
Add oil to the tank to maintain the proper oil level as the system fills.
Operation will be smooth when all air is purged from the system by continuing to move the rudder for several
minutes.
f. The pump relief valve is set at the factory; however, if a different pressure setting shoud be required proceed as
l
follows. Note the reading of the pressure gauge as the directional valve is manually activated for right or left rudder.
After the rudder reaches the hardover position, adjust the pump relief valve, if necessary, until the indication is 2200 psi
or less, as required.
g. The cylinder relief valves are set at the factory to 200 psi above the pump relief valve setting. If resetting is
required, follow the procedure in Step f. The pump relief setting must be temporarily increased while setting the cylinder
relief valve.
3-3239
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