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Section 8: Troubleshooting
Section 8: Troubleshooting
Symptoms
Starting motor does not crank
engine.
Engine cranks but does not
start.
Engine runs with continuous
misfiring, runs unevenly, or runs
erratically.
Grass cutting is ragged or
uneven
Loss of power or system will not
operate in either direction.
50
ZST40 & ZST48 Zero Turn Mowers 357-505M
Table of Contents
Troubleshooting Chart
Probable Causes
Control levers are not in neutral position
and fully out.
Park brake not engaged (ON).
Control lever interlock switch is not
adjusted correctly.
Blade Engagement switch is engaged.
Weak or dead battery.
Loose or broken switches
and/or damaged electrical wiring.
Other causes
No fuel in the fuel tanks.
Fuel filter and/or fuel line plugged.
Other causes
Other causes
Dull, bent, or broken cutting blades.
Deck full of wet sticky grass.
Cutting Blades are not operating at full
engine speed.
Belt over center take-up is loose.
Worn or broken belt.
Deck is not level.
Bypass valve is open.
Bypass assembly is sticking.
Mower is loaded excessively.
Steering hardware is loose or lost.
Bad ground drive belt and/or pump idler
pulley.
Loose, lost, or broken belt take-up spring. Reattach or replace belt take-up rod.
Restrictions in air cleaner.
Internal interference or leakage in
transaxle.
Oil level in transaxle is low.
Poor compression.
Steering linkage is bent or needs
adjustment.
Air is trapped in the hydraulic system.
Other causes
Suggested Remedies
Place control lever in neutral and fully out.
Engage park brake.
Have your dealer re-adjust the interlock
switch.
Disengage blade switch.
Recharge or replace.
Repair or replace switches and electrical
wiring.
See Engine Operator's Manual.
Fill tank.
Replace fuel filter and/or fuel line.
See Engine Operator's Manual.
See Engine Operator's Manual.
Sharpen or replace cutting blades.
Clean underside of deck.
Increase engine rpms to full speed (3600
rpm)
Check engine speed with Land Pride
Inductive Tachometer, Part No. 890-909C.
Tension over center take-up.
Replace worn and broken belt
See "Belt Maintenance" on page 32.
Check air pressure in all 4 tires
Make level adjustments to the deck
See "Deck Cutting Height and Leveling" on
page 25.
Close bypass valve. See "Moving Mower with
Stalled Engine" on page 14.
See your dealer.
Reduce load on mower.
Replace steering hardware.
Replace belt and/or idler pulley Tighten idler
pulley if loose.
Service air cleaner.
See your dealer.
Fill transaxle to the correct level.
See your dealer.
Adjust linkage See "Steering Adjustments" on
page 22.
Purge transaxle of air or see your dealer.
See Engine Operator's Manual.
12/15/15
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