Piston (Traction) Pump Control Solenoid Coils - Toro Groundsmaster 5900 Series Service Manual

Piston (Traction) Pump Control Solenoid Coils

Electrical System: Component Testing
g288613
1. Piston pump
2. Forward solenoid coil
3
5 N·m
(44 in-lb)
g288614
1. Solenoid coil
2. O−ring
The piston (traction) pump uses an electronic control assembly to change the
position of the swash plate and the pump displacement. Electrical outputs from
the machine TEC controller are provided to two (2) solenoid coils for pump
control. One solenoid controls the A side pump displacement (forward direction)
and the other controls the B side pump displacement (reverse direction) The
piston pump control assembly is attached to the left side of the piston pump
(Figure 268).
Note: To assist in troubleshooting, the piston pump solenoid coils can be
exchanged because they are identical. If the problem follows the exchanged coil,
a problem with the coil is likely. If the problem remains unchanged, something
other than the solenoid coil is at fault (e.g. traction pedal, traction pedal position
sensor, circuit wiring, hydraulic problem).
1
Figure 267
3. Reverse solenoid coil
2
1
2
Figure 268
3. Coil nut
Page 6–124
2
3
5 N·m
(44 in-lb)
3
2
1 2
Groundsmaster ®
16227SL Rev B
5900 & 5910