should indicate 320 10 PSI. If not, re-
move relief valve cap located next to pump
Hydraulic Fluid is highly toxic to
IN port. Adjust relief valve to obtain 320
skin, eyes and respiratory tract.
10 PSI. Open throttling valve and permit
Eye and skin protection required.
approximately one gallon to flow through
Good general ventilation is normal-
valve. Close valve and check gauge, read-
ing should be 320 10 PSI. If not, readjust
b, Damaged threads on suction and dis-
relief valve. Install relief valve cap after
charge ports may be retapped with a 1/2
adjustment is made.
i n c h N.P.T.F. tap. Flush pump with clean
hydraulic fluid to remove cuttings after r e -
e. Open throttling valve. Slowly close
test stand restriction valve until a flow of
8-98. HYDRAULIC PUMP TEST AND
2 GPM is indicated on flow meter. Check
ADJUSTMENT (ON PRECISE
gauge, reading should be 320 10 PSI.
--ENERATOR SETS ONLY).
Test and adjust the hydraulic pump
f. Remove pump from test equipment.
Replace pump that does not provide a min-
imum of 2 GPM at 320 10 PSI.
Rotation of pump is clockwise as
viewed from drive end.
a. Connect hydraulic pump drive shaft
hydraulic pump in reverse order of index
to suitable vary-drive capable of 0 to 2500
numbers assigned. P a y particular atten-
t i o n to the following.
b. Connect supply line of suitable hy-
Use one wrap of thread sealing tape
draulic test stand to IN port of pump. Pump
or thread sealing compound MIL-T-5544 when
should have fluid reservoir mounted higher
i n s t a l l i n g elbows (7) . Apply a liberal
than pump inlet.
amount of grease MIL-G-10924 to the pump
s h a f t , coupling (6) and drive shaft.
G r e a s e will prevent coupling from drop-
Test stand should have an adjustable
p i n g when installing pump and reduce wear
restriction valve in return line after
i s pointing down.
c. Connect a suitable 0 to 500 PSI gauge
c. Rotate shaft with fingers to posi-
and throttling valve to OUT port of pump.
t i o n tang drive to mate with coupling
Connect out port of throttling valve to test
stand flow meter.
d. Open throttling valve and test stand
restriction valve. Start vary-drive and
Do not force pump onto drive flange.
adjust speed to 1500 to 2116 RPM. Slowly
close throttling valve and observe gauge
d. Pump must seat squarely on drive
reading. With valve fully closed, gauge