TM 5-3805-291-23-1
HYDRAULIC SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0017 00
LIFT AND TILT CYLINDER DRIFT CHECK - CONTINUED
Lift Cylinder Drift Check - Continued
7.
Start and run engine at low idle (TM 5-3805-291-10).
8.
Lower bucket to ground (TM 5-3805-291-10).
9.
Stop engine (TM 5-3805-291-10).
Tilt Cylinder Drift Check
WARN I N G
Injury or death to personnel can result from sudden movement of lift or tilt cylinders. Do not stand under
work tool while testing or adjusting lift or tilt cylinders.
N OT E
This test will check drift rate oftilt cylinders. The drift rates will change according to conditions
including: hydraulic oil temperature, type of bucket, load in bucket, etc.
Bucket should be empty during tests.
Auxiliary cylinders will drift in CLOSE (LOWER)direction because of orifice in rod end line.
Orifice connects to tank.
1.
Start and run engine at low idle (TM 5-3805-291-10).
2.
Warm hydraulic oil to 120 to 150F (49 to 65C) (TM 5-3805-291-10).
3.
To check lift circuit, raise bucket to maximum height and keep bottom of bucket parallel to ground. Move control lever
to HOLD position.
4.
Stop engine (TM 5-3805-291-10).
N OT E
If amount of cylinder drift is within specification, tilt circuit is not causing drift problem.
5.
Record cylinder rod movement. Maximum drift for different temperatures in Table 2 is 0.79 in. (20.0 mm).
Table 2. Lift Cylinder Drift.
Oil Temperature
Time for Drift
122 to 149F (50 to 65C)
2.7 minutes
150F (66C) or more
1.7 minutes
If there is too much drift, check anti-drift valve for tilt function and check tilt back line relief valves (perform Relief
6.
Valve (Line) Set and Adjustment) in this work package.
7.
Start and run engine at low idle (TM 5-3805-291-10).
8.
Lower bucket to ground (TM 5-3805-291-10).
9.
Stop engine (TM 5-3805-291-10).
0017 00-46
