Johnston VT551 Maintenance Section page 93

VT551 - Maintenance
FAULT SYMPTOM
Brush slows down after
2.
Works intermittently
Brush fails to lift
2.
3.
FAULT SYMPTOM
Maxigap will not tilt
3.
Page Issue 01
CHANNEL BRUSH
1.
3.
1.
2.
1.
MAXIGAP NOZZLE
1.
2.
POSSIBLE CAUSE
Hydraulic pump worn
Channel brush motor worn
Check hydraulic pressure for fault diagnosis
Check switch in control panel and looms for
loose connections - using J-plex
Check hydraulic valves Y1 (LH) or Z1 (RH)
Check for electrical power at solenoid/plug LED
V5 (LH) or V10 (RH) if a dual
Check pneumatic solenoid for correct operation
Seals in cylinder leaking
POSSIBLE CAUSE
Check feed to pneumatic solenoid/plug LED V8
(LH) or V7 (RH) if a dual
Pneumatic solenoid valve faulty. - check manual
override
Cylinder pivot/linkage seized
Chapter - Fault Diagnosis
14:7