MacDon M1240 - Page 514

215916 494 Revision A
7.5 Traction Drive Troubleshooting
Problem Solution
Section
Symptom: The warning alarm sounds and the low charge pressure warning appears on the Harvest Performance
Tracker (HPT).
Low hydraulic oil level
Shut down engine, and add oil to
hydraulic system.
5.7.3 Checking Hydraulic Oil, page 373
Low hydraulic pressure
Contact Dealer.
—
Faulty sender
Contact Dealer.
—
Symptom: Wheels lack necessary ability to pull on a grade or when pulling out of a ditch.
Internal pump or motor damage
Contact Dealer.
—
Insufficient torque at drive wheels
Maintain engine rpm, decrease GSL
setting.
—
Loose or worn controls Check controls. Contact Dealer
Brakes binding or not releasing fully Check charge pressure.
Contact Dealer
Relief valve in tandem pump dirty or
damaged
Replace relief valve.
Contact Dealer
Symptom: With the steering wheel centered, one wheel pulls more than the other wheel.
Leakage at pump or motor
Contact Dealer.
—
Binding or interference with controls
under cab
Contact Dealer.
—
Faulty relief valve Repair or replace valve Contact Dealer.
Contact Dealer
Symptom: Both wheels will not pull in forward or in reverse.
Loose hardware on pump controls Repair or tighten.
Contact Dealer
Brakes binding or not releasing fully Check charge pressure.
Contact Dealer
Low oil level and low charge pressure
Check oil reservoir level.
5.7.3 Checking Hydraulic Oil, page 373
Wheel drives disengaged Engage wheel drives.
Contact Dealer
Servo input loose
Check servo. Contact Dealer
Failed pump
Contact Dealer.
—
Symptom: One wheel will not pull in forward or in reverse.
Broken pump arm or shaft
Contact Dealer.
—
Steering controls worn or defective
Check GSL and steering for loose,
worn or damaged ball joints and
connecting rods.
Contact Dealer
High pressure relief valve stuck open,
damaged seat
Contact Dealer.
—
Brakes binding or not releasing fully Check charge pressure.
Contact Dealer
Failed pump, motor or final drive
Contact Dealer.
—
Symptom: Excessive noise from the drive system.
Mechanical interference in steering or
ground speed linkage
Remove interference.
Contact Dealer
Brakes binding or not releasing fully
Check charge pressure.
Contact Dealer
Faulty pump or motor
Contact Dealer.
—
Air in system
Check lines for leakage.
—
Hydraulic line clamps loose Tighten clamps.
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TROUBLESHOOTING