Johnston VS501, Секция обслуживания

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All Copyright and rights are the property of Johnston Sweepers Ltd
V Range 501
l
651
l
801 Maintenance Manual
MA8:2
Chapter - Fault Diagnosis
Water Systems
Fault Symptom Possible Cause
Jet continuously leaking 1. Grit under armature seating.
2. Armature stuck open.
No water to wash down hose or jets 1. Water pump filter blocked.
2. Water tank filter blocked.
3. Drain tap on filter open.
4. Filter isolation valve closed.
5. Filter assembled incorrectly.
6. Pump valves fitted incorrectly after overhaul.
Lack of pressure 1. Grit under relief valve seating.
2. Relief valve spring broken.
3. Relief valve stuck open.
4. Relief valve worn.
Pneumatic Systems
Fault Symptom Possible Cause
Air leak from solenoid block 1. Cylinder seals leaking internally.
2. Air solenoid faulty.
Hydraulic Systems
Fault Symptom Possible Cause
Hydraulic oil frothing 1. Air getting into system. Check LP pipe to pump.
2. Defective pump shaft seal.
3. Return pipe separated from underside of return filter
inside hydraulic tank.
Sluggish hydraulics 1. Cartridge valve not travelling full extent - measure
oil flow.
2. Blocked filters.
3. Air in oil.
Page Issue A
Audible Warning
Fault Symptom Possible Cause
Audible warning on continuously 1. Air pressure switch faulty.
2. Insufficient pressure in Johnston system.
3. Low Hydraulic oil level.
4. Body raised.
5. Rear door open.
POWER SYSTEMS