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Repair manual

ManualsBrandsWacker Neuson ManualsPower RollerRD 27-100
51525354555657585960
Troubleshooting the Drive System RD 27
wc_tx000949gb.fm 52
Neutral brake
solenoid
The neutral brake solenoid is part of the drive pump. It controls oil flow to the
brakes and to the control group. When the neutral brake solenoid is de-energized
(parking brake ON, operator off seat, or engine OFF), oil is diverted from the
control group and from the brakes back to the tank. In this state, the SAHR-type
brakes engage and the machine stops.
Seat switch
solenoid
The seat switch solenoid controls oil flow/pressure from the FWD/REV control lever
to the swash plate of the drive pump. When the operator is seated, the seat switch
solenoid energizes and provides flow/pressure.