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Section 8: Troubleshooting
Symptoms
Engine is overheating
Low engine oil pressure
(Indicated by oil light being on
while engine is running.)
High engine oil consumption
Mower is jerky when starting to
travel.
Steering levers do not return to
neutral.
Mower creeps when steering
control levers are in neutral.
Mower circles or veers in one
direction.
Mower travels only in one
direction
Transaxle is noisy
Transaxle leaks oil
Transaxles operates hot.
12/15/15
Table of Contents
Troubleshooting Chart
Probable Causes
Air intake screen or cleaning fins
clogged.
Not operating engine at rated speed.
Other causes.
Low oil level.
Oil diluted or too light.
Other causes.
Steering linkage is bent or needs
adjustment.
Drive belt is slipping.
Pulleys are worn or damage.
Transaxle is faulty.
Steering linkage is out of adjustment.
Steering linkage is bent, broken or
missing.
Transaxle neutral return spring is broken
or missing.
Steering linkage is out of adjustment.
Tires are not inflated properly.
Steering linkage is bent or needs
adjustment.
Bypass assembly is sticking.
Steering linkage is bent or needs
adjustment.
Drive belt is slipping.
Pulleys are worn or damage.
Transaxle is faulty.
Oil level in transaxle is low.
Oil is contaminated.
Transaxle has some loose parts.
Bypass assembly is sticking.
Air is trapped in the hydraulic system.
Seals, housing, or gaskets are damaged. See your dealer.
Air is trapped in hydraulic system.
Hydro-drive faulty.
Not operating engine at rated speed.
Suggested Remedies
Clean screen and fins.
Increase engine speed to 3600 rpm.
See Engine Operator's Manual.
Add oil.
Change oil and check for source of
contamination.
See your dealer.
Adjust linkage See "Steering Adjustments" on
page 22.
Retention or replace drive belt.
Replace worn and damaged pulleys.
See your dealer.
Adjust linkage See "Steering Adjustments" on
page 22.
Replace steering linkage.
See item 1 on page 22.
Replace transaxle neutral return spring.
Adjust linkage See "Steering Adjustments" on
page 22.
Inflate tires to the correct tire pressure.
Adjust linkage See "Steering Adjustments" on
page 22.
See your dealer.
Repair or replace linkage.
Retention or replace drive belt.
Replace worn and damaged pulleys.
See your dealer.
Fill transaxle to the correct level.
See your dealer.
See your dealer.
Purge transaxle of air or see your dealer.
Purge transaxle of air or see your dealer.
See your dealer.
Increase engine speed to 3600 rpm.
ZST40 & ZST48 Zero Turn Mowers 357-505M
51
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