Manitowoc Grove 5540F Service Manual

GROVE Published 10-21-2010, Control# 198-04 6-25
5540F/YB5515 SERVICE MANUAL ENGINE AND ENGINE SYSTEMS
6
CONDITION: Engine runs too rich on LPG
CONDITION: Engine will not start on LPG
Checks and Adjustments
Spark Plug Gap
Check, clean and adjust the spark plugs every 3 months, or
after every 500 hours of operation, whichever occurs first, or
more often if required.
Thoroughly, clean the spark plugs, including the threads.
Check the electrode gap with a feeler gauge. There will be a
small amount of friction as you move the feeler gauge
between the electrodes, if adjusted correctly. Bend only the
side of the electrode to set the gap.
Engine Timing
The engine timing should be checked and set as follows:
1. Connect the timing light to the No. 1 spark plug wire
(front cylinder).
2. Start the engine and let it run at idle.
3. Check the timing on the crankshaft pulley, in relation to
the pointer on the timing cover.
4. Timing should be:
Past Production Units.......... 11° BTDC ± 1°
Current Production Units.......10° BTDC ± 1°
5. If timing needs to be adjusted. Loosen the distributor
hold down clamp screw and turn the distributor
clockwise or counterclockwise to adjust the timing.
6. After adjusting the timing, tighten the distributor clamp
screw, turn the engine off and remove the timing light.
Verify each item below: Remedy for each item:
Verify that there are no
leaks into the vacuum port
on the LPG mixer.
Replace or repair the hose.
Check for clogged air filter. Repair or replace.
Check for exhaust leaks
before the O2 sensor.
Repair air leaks in the
exhaust system.
Verify that the O2 sensor is
working properly.
See Error Code 13.
Verify idle air screw is
adjusted at idle. Fuel trim
valve will have a 50% duty
cycle.
Turn the adjustment screw
counterclockwise to lean
out the air/fuel mixture.
Check for faulty LPG
vaporizer.
Replace if LPG vapor
pressure is not greater that
Atmospheric pressure -
“W.C.
Verify each item below: Remedy for each item:
Check fuel shut-off valve.
Cycle ignition switch ON/
OFF, fuel shut-off valve
should click off after 2
seconds.
Check for obstructions in
fuel line.
Check wiring and fuse/
relay.
Clogged LPG filter.
Close liquid fuel tank valve.
Repair or replace LPG
filter. Open liquid fuel tank
valve and check for leaks.
Check for stuck open
vacuum valve.
Clean valve. Check wiring.
Check for clogged small air
filter on top of the
vaporizer.
Clean or replace air filter
and orifice jet.
Check for carburetor
malfunction.
Check diaphragm for hoe
and damage. Repair or
replace.
Past Production Units 0.035 in (0,90 mm)
Current Production Units 0.030 in (0,0762 mm)
Reference Only

Manitowoc Grove 5540F Specifications

General

Brand	Manitowoc
Model	Grove 5540F
Category	Construction Equipment
Language	English