Traction Circuit Problems; Testing 4 - Toro GroundsmasterR 4300-D Service Manual

Traction Circuit Problems

Problem
Neutral is difficult to find or machine
operates in one direction only
Traction response is sluggish
No traction in either direction
Single wheel motor turns while
unloaded, but slows down or stops
when load is applied
Groundsmaster 4300--D
Possible Causes
Traction control linkage is misadjusted, disconnected, binding or
damaged.
Piston (traction) pump check relief valve is not seating or is damaged
(NOTE: Piston (traction) pump check relief valves for forward and
reverse are identical and can be reversed for testing purposes).
Piston (traction) pump is worn or damaged.
Hydraulic oil is very cold.
Parking brake is dragging or binding.
Piston (traction) pump bypass valve is loosened or is damaged.
Charge pressure is low.
Flushing valve in traction pump is not seating or is damaged.
Piston (traction) pump charge relief valve is not seating or is damaged.
Piston (traction) pump check relief valve is not seating or is damaged
(NOTE: Piston (traction) pump check relief valves for forward and
reverse are identical and can be reversed for testing purposes).
Piston (traction) pump is worn or damaged.
Parking brake is applied, dragging or binding.
Traction control linkage is misadjusted, disconnected, binding or
damaged.
Oil level in hydraulic reservoir is low (other hydraulic systems are
affected as well).
Piston (traction) pump bypass valve is loosened.
Flushing valve in traction pump is not seating or is damaged.
Piston (traction) pump check valve is not seating or is damaged.
Charge pressure is low.
Wheel motor(s) and/or piston (traction) pump are worn or damaged
(NOTE: If a traction circuit component has internal wear or damage, it
is possible that other traction circuit components are also damaged).
Wheel motor is worn or damaged (NOTE: If a traction circuit
component has internal wear or damage, it is possible that other
traction circuit components are also damaged).
Page 4 - - 27 Hydraulic System