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Page Title:
TILT, LIFT AND RIPPER CIRCUIT SPEED TESTS |
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 TM 5-2410-233-23
HYDRAULIC SYSTEM TESTS - CONTINUED
0167 00
TILT, LIFT AND RIPPER CIRCUIT SPEED TESTS
1.
Hydraulic filter elements should be changed, if dirty, before performing the following speed tests.
2.
Oil must be of recommended viscosity and at normal operating temperature to ensure accurate test results.
3.
Speed tests are made with engine at high idle.
4.
Speeds in Table 1 are those of a machine equipped with a tilt, lift and ripper circuit.
5.
System speeds similar to speeds given indicate that circuits are operating normally. However, relief valves should be
tested to ensure they are set at proper settings.
6.
If only lift circuit or only tilt circuit has slow speeds, check slow circuit for excessive drifting.
Table 1. Tilt, Lift and Ripper Circuit Speed Tests.
CIRCUIT SPEED TEST
TRAVEL TIME SPEED IN SECONDS
Tilt Circuit
Time needed to move tilt cylinder rod from fully
2.2
retracted to fully extended position.
Time needed to move tilt cylinder rod from fully
1.7
extended to fully retracted position.
Lift Circuit
Time needed to raise blade from ground level to
2.9 to 3.0
maximum height.
Ripper
Time needed to raise ripper from fully extended to
4.8
fully retracted position.
7.
If all circuits are slow, check for pump malfunctioning. Also check main pressure relief valve for leakage or low pres-
sure setting. Refer to Pump Efficiency Tests (On Machine) and Pressure Relief Valve Tests in this work package.
HYDRAULIC SYSTEM TEST PROCEDURES
1.
Introduction.
a.
Check relief valve setting at low idle. Refer to Pressure Relief Valve Tests in this work package. If relief valve pres-
sure can be obtained at low idle, pump is working correctly.
b.
If machine is equipped with a tilt and/or ripper circuit, put a tap into these circuits and check for relief valve pres-
sure at low idle. If relief pressure cannot be read on gage in all circuits, pump or relief valve is probably bad. If
pressure cannot be read in only one circuit, refer to drift tests for that circuit for further testing.
0167 00-3
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