Tandem Traction (Piston) Pump Control Solenoid Coils
g233999
Figure 113
1.
Tandem piston (traction) pump (P1 and P2) 4.
Solenoid AB-C2 (front pump valve C2 –
reverse)
2.
Solenoid AB-C1 (front pump valve C1 –
forward)
5.
Solenoid CD-C2 (rear pump valve C2 –
reverse)
3.
Solenoid CD-C1 (rear pump valve C1 –
forward)
The tandem traction (piston) pump uses two separate electronic control
assemblies. One assembly controls the output for the front pump and one for
the rear pump. Each control assembly includes two (2) electrically controlled
solenoid valves. One solenoid valve controls the pump displacement in the
forward direction, and the other controls the pump displacement in the reverse
direction. The control assemblies are attached to the right side of the piston
pump. Electrical outputs from the T1: TEC supplies power to the solenoid coils.
The coils are named for the pump they control (AB = front pump and CD =
rear pump) and their control function (C1 = forward direction and C2 = reverse
direction).
Note:
A faulty solenoid coil or solenoid circuit wiring problem will not be identified
by the Info Center Display. The Info Center Display can be used to verify that
output current from the appropriate controller is available for the solenoid coil,
but the display will not verify that the solenoid coil and circuit wiring is functioning
correctly; refer to
Using the InfoCenter Display for Troubleshooting (page 3–23)
.
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, circuit wiring, hydraulic problem).
Outcross 9060
Page 6–75
Electrical System: Electrical Component Testing
18234SL Rev B
Summary of Contents for 07511AA
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