12 - 2
Section E
Hydraulics
9803/6400
Section E
12 - 2
Issue 2*
Hydraulic Pump JS200, JS240
Pump Trouble Shooting (continued)
Abnormal Sound and Vibration
Cause Treatment Note
1. Cavitation. 1. Prevent cavitation. 1.1. Boost pressure is low
Check to see if hydraulic oil is 1.2. Pump is broken.
white and cloudy. 1.3. Air is sucked by suction pipe.
1.4. Suction resistance is high.
2. Damage of shoe caulking part. 2. Replace piston, shoe, shoe plate.
3. Crack in cylinder. 3. Replace cylinder.
4. Bad installation of pump. 4. Correct installation.
5. Relief valve bouncing. 5. Repair relief valve. 5. Refer to relief valve instructions.
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