Nilfisk-Advance 7765 Service Manual page 133

Service Manual – Advance 7765 / Nilfisk CR1500
Wheel System, Traction
Functional Description
Overview
The traction wheel system includes the hydraulic drive wheel motor and drive pump, and the foot pedal and
associated components that control the direction and speed of the drive wheel motor.
The drive wheel motor is driven by the variable-displacement drive pump which allows speed and directional
control. The drive pump and drive wheel motor hydraulic system is a closed system, but allows for
programmed oil leakage through the drive pump for lubrication and cooling purposes. This leaked oil returns
to the reservoir and requires make-up oil that is supplied to the drive pump through the charge circuit.
Drive Pump
The is driven by the engine and powers the hydraulic drive wheel motor. Note that the
Drive Pump
was changed in early 2010, beginning with machine serial number 1000034942, from part number
Pump
7-60-05026 to part number 56514943. This change also included changes to the forward/reverse controls.
Drive Pump Before Machine Serial Number 1000034942
The
Drive Pump
on machines
before serial
number
1000034942 is
part number
7-60-05026.
Block/Manifold
From Squeegee
Vacuum Fan
Motor
To Return
To Front
Port on Rear
Wheel Motor
Drive Pump
p/n 7-60-05026
To Rear Port on
Rear Wheel Motor
238
Drive
To Return
Block/
Manifold