TM 5-3805-291-23-1
HYDRAULIC SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0017 00
RELIEF VALVE (LINE) TEST AND ADJUSTMENT
0017 00
WARN I N G
Injury to personnel can result from hydraulic oil pressure and hot oil.
Hydraulic oil pressure can remain in hydraulicsystem after engine has been stopped. Serious
injury to personnel can result if pressure is not released before any service is done on hydraulic
system.
Make sure all attachments have been lowered andoil is cool before removing any components or
lines.
Remove oil filler cap only when en ine is stopped and filler cap is cool enough to touch with your
g
bare hand.
Sudden movement or accidental starting of machne can cause injury or death to personnel on or
i
near machine.
Testing Line Relief Valves (Tilt)
Enter service mode. Refer to Implement Hydraulic Service Mode in this work package.
1.
2.
Start and run engine at high idle with transmission in NEUTRAL (TM 5-3805-291-10).
3.
Warm hydraulic oil to 120 to 150F (49 to 65C) (TM 5-3805-291-10).
4.
Position lift arms on jack stand.
5.
Record steady state engine rpm.
N OT E
In the following steps, do not keep tilt control lever in full TILT BACK position for more than five seconds
while pressure is at relief setting.
6.
With engine speed at high idle, hold tilt control lever in full TILT BACK position (TM 5-3805-291-10).
N OT E
Once engine rpm has stabilized,engine rpm should agree with reading recorded in step 3 ( 5
rpm).
If reading does not agree withreading in step 3, replace tilt back line relief valve.
If reading agrees with readingin step 3, proceed to step 6.
7.
Record steady state engine rpm.
N OT E
In the following steps, do not keep tilt control lever in full DUMP position for more than five seconds while
pressure is at relief setting.
8.
With engine speed at high idle, hold tilt control lever in full DUMP position (TM 5-3805-291-10).
N OT E
Once engine rpm has stabilized,engine rpm should agree with reading recorded in step 3 ( 5
rpm).
If reading does not agree with reading instep 3, replace dump line relief valve.
If reading agrees with reading in step 3, pr ceed to testing auxiliary line relief valve.
o
9.
Record steady state engine rpm.
10.
Stop engine (TM 5-3805-291-10).
