TM 5-3805-290-23-1
TROUBLESHOOTING INTRODUCTION - CONTINUED
0004 00
OPERATIONAL CHECKS (HYDRAULIC SYSTEM) - CONTINUED
3.
Lift loader bucket (TM 5-3805-290-10).
4.
Lower loader bucket (TM 5-3805-290-10).
5.
Dump loader bucket (TM 5-3805-290-10).
6.
Tilt back loader bucket (TM 5-3805-290-10).
7.
Repeat steps 2 thru 6 several times.
8.
Turn steering wheel fully right and left (TM 5-3805-290-10).
9.
Repeat step 8 several times.
10.
Watch cylinders as they extend and retract. Movement must be smooth and regular.
11.
Listen for noise from pump.
12.
Listen for sound of line relief valves. Relief valves should open only when cylinders are fully extended or retracted or
bucket is empty.
13.
Check lines and hoses for leaks.
14.
Loader lift control lever has a detent solenoid in FLOAT position. Ensure that detent functions properly.
15.
Loader bucket tilt control lever has a detent in RACK BACK position. RACK BACK operates when bucket is between
full dump and bucket angle in order to dig. Ensure detent functions properly.
Cycle Times for Hydraulics
1.
Start engine and run engine at high idle (TM 5-3805-290-10).
2.
Increase oil temperature to a minimum of 140F (60C) by operating each work tool several times.
N OT E
Leave engine at high idle except for steering test at low idle. The test for bucket dump should be done
from the RACK BACK position. Rack back test should be done from DUMP position. The test for lift
should be done from GROUND position. The power down test and float lower test should be done from
FULL RAISED position. The steering test should be done from stop to stop.
During tests, implement may hit ground heavily. Care should be taken in order to protect finished
ground surfaces.
Table 1. Cycle Times in Seconds.
POSITION
CYCLE TIME
Rack Back
2.4 to 2.9
Bucket Dump
1.6 to 1.9
Lift
5.0 to 5.5
Power Down
3.0 to 3.5
Float Lower
2.5 to 3.0
Steering (Low Idle)
3.7
Steering (High Idle)
1.6
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