GB - 30
TROUBLESHOOTING
PROBLEM
PROBABLE CAUSE
CORRECTION
Engine does
not crank.
1. PTO engaged.
2. Parking brake disengaged.
3. Loose or corroded battery
cables.
4. Discharged battery.
5. Faulty starter.
1. Disengage PTO.
2. Engage parking brake.
3. Clean and tighten battery
cables (see Clean Battery
on page 20).
4. Charge battery (see
Charging the Battery on
page 21).
5. See your Gravely Dealer.
Engine cranks
but does not
start.
1. Fuel tank empty.
2. Faulty spark plug.
3. Air cleaner is plugged or
dirty.
4. Fuel filter is dirty.
5. Faulty engine.
1. Fill fuel tank (see FILLING
2. Replace spark plug. Refer
to Engine Manual.
3. Clean or replace air cleaner.
Refer to Engine Manual.
4. Clean or replace fuel filter.
Refer to Engine Manual.
5. Refer to Engine Manual or
see your Gravely Dealer.
Battery light
does not light
up when
starting
engine.
1. Discharged battery.
1. Charge battery (see
Charging the Battery on
page 21).
Oil pressure
light is on.
1. Oil pressure is low.
1. Refer to Engine Manual.
Engine
continues to
run when
ignition key is
in the off
position.
1. Ignition ground wire
disconnected.
2. Ignition switch failure.
1. Connect ground wire to
clean metal surface.
2. Replace ignition switch (see
your Gravely Dealer).
PTO or mower
blades do not
engage or shut
off.
1. Operator presence switch
not depressed.
2. Faulty PTO switch.
1. Depress operator presence
switch by sitting on seat.
2. Check the electrical system
to the clutch for damage or
wear. See your Gravely
Dealer.
Unit does not
drive.
1. Parking brake engaged.
2. Transmission bypass levers
open.
3. Hydraulic oil level low.
4. Faulty hydraulic drive
system.
1. Disengage parking brake.
2. Close transmission bypass
levers (see MOVING THE
UNIT WITH THE ENGINE
OFF on page 14).
3. Add hydraulic oil (see
Check Hydraulic Fluid Level
on page 18).
4. See your Gravely dealer.
Summary of Contents for Promaster 144
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