All Copyright and rights are the property of Johnston Sweepers Ltd
MA8:9
V Range 501 l 651 l 801 Maintenance Manual
Johnston Sweepers Limited
Chapter - Fault Diagnosis
Page Issue A
Fault Symptom Possible Cause
No forward/reverse drive 1. Is the chassis in the correct gear EG 1:1.
2. On dual sweep m/c has drive for power steering changeover
been correctly selected.
3. Is master switch V1 illuminated.
4. Has engine increased from tickover to 1100 rpm.
5. Check boost pressure on transmission pump is 24 bar.
6. If fan/sweep gear operates check feed at Mills plug on
transmission pump. The voltage at pins A and B should
be 0-2.5 volts dependant upon pedal position. If okay, refit
plug ensuring it is screwed fully home. If no voltage, call for
service assistance.
VS - Single Engine
HYDRODRIVE GEARBOX SYSTEM
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