Toro Groundsmaster 4100-D Service Manual page 69

Traction Circuit Problems
Problem
Machine operates in one direction
only.
Traction pedal is sluggish.
Machine travels too far before stop-
ping when the traction pedal is re-
leased.
Traction power is lost or unit will not
operate in either direction.
Low speed (4WD) will not engage.
Low speed (4WD) will not disen-
gage.
Groundsmaster 4100--D/4110--D
Possible Cause
Traction control linkage is faulty.
Traction relief valve is faulty.
Traction control linkage is stuck or binding.
Charge pressure is low.
Piston (traction) pump servo control valve orifices are plugged or
damaged.
4WD manifold PD1 and PD2 pilot directional valves seals are leaking
or damaged.
Traction linkage is out of adjustment.
Traction pedal does not return to neutral.
Charge pressure is low.
Piston (traction) pump servo control valve orifices are plugged or da-
maged.
Hydraulic reservoir oil level is low.
Piston pump by--pass valve is open or damaged.
Charge pressure is low.
Traction circuit pressure is low.
Front wheel motor couplers are damaged.
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve (SV) in 4WD manifold is faulty.
Cartridge valve(s) in 4WD manifold is faulty.
Drive gear on rear axle motor or driven gear for rear axle is loose or
damaged.
Rear axle motor is damaged.
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve (SV) in 4WD hydraulic manifold is faulty.
Cartridge valve in 4WD manifold is damaged or sticking.
Page 4 - - 31 Hydraulic System