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Page Title:
Table 4-3. Hydraulic Performance Checks During System Test |
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 TM 55-4920-405-13&P
Table 4-3. Hydraulic Performance Checks During System Test
I
Abnormal
Corrective
Action
Action
Indication
Step
Repair or replace.
COMPENSATOR SHUT-
COMPENSATOR
1
Turn COMPENSA-
SHUTOFF VALVE
OFF VALVE cannot be
TOR SHUTOFF
closed because it is
can be closed.
VALVE (17, fig-
defective,
ure 2-1) slowly
CW to close.
2
a. Close COMPENSATOR
Desired GPM cannot be
Adjust VOLUME
FLOW INDICA-
SHUTOFF VALVE .
o b t a i n e d , Probable
control (14, figure
TOR GPM reads
b. Add hydraulic fluid to
2-1) as needed to
desired GPM.
cause:
reservoir.
obtain desired
COMPENSATOR
a.
c Replace low pressure
GPM flow reading
SHUTOFF VALVE
filter.
on FLOW INDI-
not fully closed.
CATOR GPM (11,
b. Hydraulic fluid
level too low,
c . Low pressure filter
clogged, as shown
by lighting of LP
P indicator (20,
3
Set HIGH PRESS
HIGH PRESS BY-
HIGH PRESS BYPASS
Repair or replace.
PASS VALVE can
BYPASS VALVE
VALVE cannot be
control (19, fig-
closed because valve
be closed.
is defective,
ure 2-1) to
CLOSED.
4
FLUID PRESSURE
FLUID PRES-
Adjust HIGH
Adjust, repair or replace
GAGE reading is much
valve.
SURE GAGE (5,
PRESS RELIEF
higher than specified,
figure 2-1) reads
VALVE (18, fig-
ure 2-1) to re-
Probable cause:
about 200 PSI
above pressure
HIGH PRESS RELIEF
lieve pressure at
needed by sys-
V A L V E incorrectly
about 200 PSI
tem to be tested.
adjusted or defective.
above pressure
needed by system
to be tested.
5
Turn COMPEN-
FLUID PRES-
COMPENSATOR SHUT-
Repair or replace valve.
SATOR SHUTOFF
SURE GAGE (5,
OFF VALVE cannot be
figure 2-1) read-
opened because it is
VALVE (17, fig-
ure 2-1) fully
ing drops to be-
defective.
low 1000 PSI.
CCW to open.
D e s i r e d pressure read-
6
Repair or replace PRES-
Adjust PRES-
FLUID PRES-
a.
ing cannot be obtained.
SURE COMPEN-
SURE COMPENSATOR.
SURE GAGE (5,
T e s t , service, repair or
Probable cause:
b.
SATOR (16, fig-
replace pump.
ure 2-1) CW to
reads desired
a . Defective PRES-
c . Replace defective gage.
obtain desired
s y s t e m pressure.
SURE COMPEN-
s y s t e m pressure.
SATOR.
b. Defective hydraulic
pump,
c. Defective FLUID
PRESSURE GAGE .
7
a. (1) Repair
or replace de-
Turn FLOW CON-
a. FLUID PRESSURE
FLUID PRES-
fective
valve.
GAGE reads higher
TROL VALVE
SURE GAGE (5,
(2) Adjust
or replace de-
(12, figure 2-1)
than selected sys-
fective
valve.
fully CCW to open.
tem pressure plus
reading stays at
200 PSI. Probable
or below value
cause:
set in step 4.
4-6
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