August 2016
5 - 2 AL4 • AL4000 Part No. 218567
Section 5 • Troubleshooting
Troubleshooting
Possible Cause SolutionProblem
Boom will not rise to the
operating position
Yoke pin is in place Remove yoke pin
Faulty cable or pulley Inspect and repair as needed
Faulty winch Inspect and repair as needed
Boom will not telescope Telescope lock pin closed Open telescope lock pin
Faulty cable or pulley Inspect and repair as needed
Faulty winch Inspect and repair as needed
Engine will not turn over No power Inspect and repair battery cables
and connections as needed
Inspect and charge or replace
battery as needed
Inspect and replace fuse
Faulty starter Inspect and repair as needed
Faulty starter switch Inspect and repair switch and/or
switch wiring as needed
Engine overheats Low coolant level Top off radiator and coolant
overfl ow tank with correct coolant
mixture per engine Operator's
Manual
Radiator is blocked Clear the radiator fi ns
Radiator or cooling system
clogged or corroded
Inspect and repair as needed
Fan or radiator cap faulty Inspect and repair as needed
Fan belt is loose Tighten fan belt
Unsuitable fuel used Drain fuel system and replace
with specifi ed fuel
Thermostat faulty Inspect and repair as needed
Head gasket faulty Inspect and repair as needed
Engine runs but produces a
dense smoke
Low compression Inspect for broken/seized piston
rings OR inspect valve clearance
Crankcase oil level is too high Drain oil to the proper level
Injector nozzle faulty Replace injector
Combustion incomplete due to
faulty injector timing, poor valve
adjustment or poor compression
Inspect and repair as needed
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