12 - 1
Section E
Hydraulics
9803/6400
Section E
12 - 1
Issue 1
Hydraulic Pump JS200, JS240
Pump Trouble Shooting
Often the regulator and attendant valves or pump are combined which makes it very difficult to discover the reason for the
trouble. Inspect the following categories which will assist in discovering the abnormal point.
1. Filter and Drain Oil Inspection.
Inspect the filter element. Check to see whether there is an abnormally large amount of foreign matter.
There will be a small amount of metallic powder due to wear of the shoe or cylinder, but if there is a large amount of
metallic powder in the filter, it may be due to trouble with the shoe.
Also check the drain oil in the pump casing.
2. Abnormal Vibration and Sound.
Check to see if there is any abnormal vibration or sound in the pump main body. Check to see if it is like the regular
frequency sound of the regulator's working or attendant valve relief working. If it is an abnormal vibration or sound, it is
possible that there is damage or cavitation inside the pump.
3. Measure Pressure of Each Part.
When it is a control problem, do not unnecessarily open ports for inspection purposes, measure the pressure for each
section and find the abnormal item.
Prime Mover Overload
When pump flow is extremely low, delivery pressures does not increase
Cause Treatment Note
1. Are the revolutions - pressure higher 1. Set to pre-determined value.
than pre-determined values?
2. Is the regulator torque setting too 2. Re-inspect regulator. 2. Refer to regulator instructions.
high?
3. Seizure or damage of pumps internal 3. Replace damaged parts. 3. Check the filter or drain oil for signs
parts of abnormal wear.
4. Wrong regulator hose connection. 4. Correct hose lines.
Cause Treatment Note
1. Regulator breakdown 1. Repair the regulator 1. Refer to regulator instructions
2. Seizure or damage of pump 2. Replace damaged parts. 2. Check filter, drain oil.
internal parts.
3. Pump breakdown. 3. Replace damaged parts. 3. Remove pump and inspect shaft
coupling.
4. Attendant valve breakdown. 4. Inspect attendant valve.
5. Incorrect regulator hose connection. 5. Correct hose lines.
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