Toro 4100-D service manual Troubleshooting, Problem Possible Cause

Troubleshooting

The charts that follow contain suggestions to assist in troubleshooting. There may possibly be more than one cause for a machine malfunction.

Refer to the Testing section of this Chapter for precau- tions and specific test procedures.

NOTE: When troubleshooting traction problems on the Groundsmaster 4100--D, if a problem exists in both 4WD and transport speeds, consider a faulty compo- nent that affects the entire traction circuit (e.g. charge circuit, relief valves, piston pump, front wheel motors). If the problem exists in 4WD but not in transport, consid- er a problem in the 4WD traction system (e.g. rear axle motor, 4WD manifold).

Problem	Possible Cause
Hydraulic system operates hot.	Engine RPM is too low.
NOTE: An indication that the hy-	Brakes are applied or sticking.
draulic system is operating at exces-	Hydraulic reservoir oil level is low.
sive temperatures would be frequent
reversing of the cooling fan and a	Hydraulic oil is contaminated or the wrong type.
normal engine coolant temperature.
	Piston pump by--pass valve is open or damaged.
	Cooling system is not operating properly.
	Charge pressure is low.
	Traction circuit pressure is incorrect.
	Pump(s) or motor(s) are damaged.
Hydraulic oil in reservoir foams.	Hydraulic reservoir oil level is low.
	Wrong type of oil is in the hydraulic system.
	Air is leaking into a pump suction line.
Machine operates in one direction	Traction control linkage is faulty.
only.	Traction relief valve is defective.
Traction pedal is sluggish.	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.
Machine travels too far before stop-	Traction linkage is out of adjustment.
ping when the traction pedal is re-	Charge pressure is low.
leased.
	Piston (traction) pump servo control valve orifices are plugged or da-
	maged.
	Traction pedal does not return to neutral.

Hydraulic System Page 4 -- 28 Groundsmaster 4100--D