Traction Circuit Problems - Toro Groundsmaster 4000-D Service Manual

Traction Circuit Problems

Problem
Machine operates in one direction
only.
Traction pedal response is sluggish.
Machine travels too far before stop-
ping when the traction pedal is re-
leased.
Traction power is lost or machine will
not operate in either direction.
LOW traction speed (mow) will not
engage.
NOTE: LOW (mow) will not engage
when the cutting decks are lowered.
LOW traction speed (mow) will not
disengage.
Hydraulic System
Possible Cause
Piston (traction) pump by--pass valve is open or damaged.
Traction relief valve is leaking or faulty.
Piston (traction) pump servo control valve orifices or screens are
plugged or damaged.
Problem with TEC output to piston (traction) pump servo control
exists (see Chapter 5 -- Electrical System).
Traction pedal components are stuck or binding.
Traction charge pressure is low.
Piston (traction) pump servo control valve orifices are plugged or
damaged.
Traction pedal components are stuck or binding.
Traction charge pressure is low.
Adjustment of relief valve (RV) in rear traction manifold is incorrect.
Piston (traction) pump servo control valve orifices are plugged or
damaged.
Hydraulic reservoir oil level is low (NOTE: Other hydraulic systems
are affected as well).
Piston (traction) pump by--pass valve is open or damaged.
Traction charge pressure is low.
Traction circuit pressure is low.
Traction pedal position sensor is not plugged in or is faulty (see
Chapter 5 -- Electrical System).
Problem with TEC output to piston (traction) pump servo control
exists (see Chapter 5 -- Electrical System).
Electrical problem exists that prevents solenoid valve S12 from be-
ing de--energized (see Chapter 5 -- Electrical System).
Solenoid valve (S12) in combination manifold is faulty.
Electrical problem exists that prevents solenoid valve S12 from be-
ing energized (see Chapter 5 -- Electrical System).
Solenoid valve (S12) in combination manifold is faulty.
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