Johnston VT501 - Channel Brush Faults; Maxigap Nozzle Faults

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MA8:7
V Range 501 l 651 l 801 Maintenance Manual
Johnston Sweepers Limited
Chapter - Fault Diagnosis
Maxigap Nozzle
Fault Symptom Possible Cause
Maxigap will not tilt 1. Check feed to pneumatic solenoid/Plug LED V1 or V9
if a dual.
2. Pneumatic solenoid valve faulty.
3. Cylinder pivot/linkage seized.
Channel Brush
Fault Symptom Possible Cause
Rotating slowly 1. Motor worn.
2. Hydraulic pump worn.
4. Channel brush worn.
3. Check hydraulic pressure to aid fault diagnosis.
Works intermittently 1. Check switch in Control Panel and looms for loose
connections.
Brush fails to lift 1. Check for electrical power at solenoid/Plug LED V5 or V6 if
a dual.
2. Check pneumatic solenoid for correct operation.
3. Seals in cylinder leaking.
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