Wheel Drive System; Functional Overview - Nilfisk-Advance HYDRO-RETRIEVER 2052 Service Manual

WHEEL DRIVE SYSTEM

FUNCTIONAL OVERVIEW

Wheel Drive System
The Hydro-Retriever ™ 2052B / CR 1300 is driven by a 4 horsepower permanent magnet motor, coupled to an automotive-type differential. The
speed of the motor is regulated by a solid-state speed control (A1), located in the front electrical compartment. A potentiometer (R2), operated
by the drive pedal, regulates the speed control.
FIGURE 1
Drive Motor
The direction of travel is controlled by contactors (K2 & K3) mounted next to the speed control. Two directional switches (S3 & S1), also operated
by the drive pedal, control the contactors. An electronic interlock (E3) is used to prevent "plugging". When the drive pedal is quickly moved from
forward to reverse, the machine coasts almost to a complete stop and then gently goes into reverse. The interlock works the same way if the pedal
is moved from reverse to forward.
The main contactor (K1) brings B+ voltage to the speed control and the forward/reverse contactors. The (S13) switch under the operator's seat
controls the main contactor, so the machine will not move without pressure on the seat.
The drive motor is protected by a 200 amp fuse, located in the left electrical compartment (as viewed facing the front of the machine). The contactor
coils and the interlock are protected by a 15 amp circuit breaker, located in the right electrical compartment (as viewed facing the front of the
machine).
64 - FORM NO. 56043052 / HYDRO-RETRIEVER™ 2052, CR 1300
Vent Tube
Differential
revised 3/00
Oil Check
& Fill