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Groundsmaster 4000--D/4010--DHydraulic System Page 4 -- 34
Traction Circuit Problems
Problem Possible Cause
Machineoperatesinonedirection
only.
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 response is sluggish. Traction pedal components are stuck or binding.
Traction charge pressure is low.
Piston (traction) pump servo control valve orifices are plugged or
damaged.
Machinetravelstoofarbeforestop-
ping when the traction pedal is re-
leased.
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.
Traction power is lost or machine will
not operate in either direction.
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).
LOW traction speed (mow) will not
engage.
NOTE: LOW (mow) will not engage
when the cutting decks are lowered.
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.
LOW traction speed (mow) will not
disengage.
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.