TM 5-3805-290-23-1
TROUBLESHOOTING INTRODUCTION - CONTINUED
0004 00
OPERATIONAL CHECKS (HYDRAULIC SYSTEM) - CONTINUED
Drift Check for Loader Cylinders
N OT E
Drift rates will change with different conditions of hydraulic components.
a.
Drift rates change according to operation.
b.
Drift rates change because of hydraulic oil temperature.
c.
Drift rates change because of type of bucket.
d.
Drift rates change because of load in bucket.
Values in Table 2 are for an empty bucket. Before you measure drift on implement, cylinders must be
extended and retracted at least five times.
1.
Place bucket in LEVEL position (TM 5-3805-290-10).
2.
Raise bucket completely (TM 5-3805-290-10).
3.
Place lift control lever in HOLD position (TM 5-3805-290-10).
4.
Record amount of movement and time on lift cylinder. Compare time to Table 2.
Table 2. Drift For Loader Cylinders.
HYDRAULIC OIL
TEMPERATURE
TIME
MAXIMUM DRIFT
140F (60C)
5 minutes
0.20 in. (5 mm)
5.
Steps for Correction.
N OT E
If drift of one or more cylinders is too much in any circuit, perform steps a thru c.
a.
Check makeup valves or line relief valves in main control valves (WP 0017 00).
b.
Replace main control valve (WP 0189 00).
c.
Replace affected cylinder (WP 0128 00 and WP 0129 00).
0004 00
OPERATIONAL CHECKS (RIDE CONTROL)
1.
Move directional control lever to NEUTRAL position (TM 5-3805-290-10).
2.
Engage parking brake (TM 5-3805-290-10).
3.
Start engine (TM 5-3805-290-10).
4.
Deactivate ride control (TM 5-3805-290-10).
5.
Lower work tool to ground (TM 5-3805-290-10).
6.
Continue to lower work tool (TM 5-3805-290-10).
7.
Front machine wheels should rise off ground.
8.
Lower front wheels to ground by raising work tool.
9.
Activate ride control (TM 5-3805-290-10).
10.
Lower work tool to ground (TM 5-3805-290-10).
11.
Continue to lower work tool (TM 5-3805-290-10).
12.
Front machine wheels should not rise off ground.
