TM 5-3895-373-34
2.51
ADJUST UNLOADING AND RELIEF VALVES.
This task covers:
a.
Check
b.
Adjust
INITIAL SETUP
Tools:
References:
General mechanic’s automotive tool kit
TM 5-3895-373-10
(Item 106, Appendix D)
TM 5-3895-373-24P
Hydraulic systems test and repair tool outfit (HSTRU)
TM 9-4940-468-14
(Item 108, Appendix D)
O-ring tool (Item 103, Appendix D)
Materials/Parts:
Hydraulic oil (Item 21, Appendix B)
Preformed packings
NOTE
Hydraulic valves can be checked and
adjusted
on
or
off
the
paving
machine. In both cases, the hydraulic
systems test and repair tool outfit
(HSTRU) is used. Off-machine
checks and adjustments apply to
valves returned to the DS/GS level for
repair.
On-machine
checks
and
adjustments apply to valves installed
in their respective hydraulic systems.
A.
CHECK.
1.
CHECK
OFF-MACHINE
UNLOADING
AND
RELIEF VALVES.
a.
Set up valve for relief pressure check and
adjustment per TM 9-4940-468-14.
b.
Slowly increase hydraulic test pressure to
approach relief pressure setting cited in the
following table. If valve opens before cited relief
pressure is reached, adjust valve to increase
relief
pressure
per
applicable
ADJUST
procedure. If valve fails to open when cited relief
pressure is reached, adjust valve to reduce relief
pressure setting. If valve adjustment does not
achieve cited relief pressure setting, repair or
replace valve.
RELIEF PRESSURE SETTING
VALVE TO BE CHECKED
PSI (kPa)
Stack Relief Valve
2500 (17 238)
Track Tensioning Relief Valve
1800 (12 411)
Track Tensioning Unloading Valve
900 (6 206)
Vibration Relief Valve
2000 (13 790)
Auger/Conveyor Relief Valves
2750 (18 961)
Tow Point Control Valves
1500 (10 343)
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