Traction Circuit Problems
NOTE: Whentroubleshootingtractioncircuitproblems,
if a problem exists in both low (4WD) and high (2WD)
speeds,consider afaulty component thataffectstheen-
tire traction circuit (e.g. charge circuit, relief valves, pis-
ton pump, front wheel motors). If the problem exists in
low speed (4WD) but not in high speed (2WD), consider
aprobleminthe4WDtractionsystem(e.g.rearaxlemo-
tor, cartridge valves in 4WD/2WD control manifold).
Problem
Possible Cause
Traction control linkage is faulty.
Machine operates in one direction
only.
Traction relief valve is defective.
Traction pedal reaction is sluggish
when in either low speed (4WD) or
high speed (2WD).
Traction control linkage is stuck or binding.
Charge pressure is low.
Piston (traction) pump servo control valve orifices are plugged or
damaged.
Traction pedal reaction is sluggish
when in low speed (4WD). Pedal
reaction is normal when in high
speed (2WD).
PD1 and PD2 pilot directional valve seals in 4WD/2WD control
manifold are leaking or damaged.
Machine travels too far before stop-
ping when the traction pedal is re-
leased.
Traction linkage is out of adjustment.
Charge pressure is low.
Piston (traction) pump servo control valve orifices are plugged or
damaged.
Traction pedal does not return to neutral.
Hydraulic reservoir oil level is low.
Traction power is lost or machine will
not operate in either direction.
Piston pump bypass valve is open or damaged.
Charge pressure is low.
Traction circuit pressure is low.
Front wheel motor couplers are damaged.
If traction is lost in low speed (4WD) but is normal in high speed
(2WD),
rear axle motor or rear axle motor drive may be faulty.
Low speed (4WD) will not engage.
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve SV in 4WD/2WD control manifold is faulty.
Cartridge valve(s) in 4WD/2WD control manifold is (are) faulty.
Electrical problem exists (see Chapter 5 -- Electrical System).
Low speed (4WD) will not disen-
gage.
Cutting decks are fully lowered.
Cartridge valve in 4WD/2WD control manifold is damaged or sticking.
Hydraulic System
Page 4 -- 36
Groundsmaster 4500--D/4700--D
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