Replacement Part List

Original instruction 13
Troubleshooting
Fault Cause Remedy
Engine not starting or hard to
start
- No gasoline in fuel tank or carburetor
- Low oil
- Start/Stop switch in STOP position
- Water in fuel, or old fuel
- Engine flooded or improperly choked
- Dirty air cleaner filter
- Dirty spark plug, wrong gap, or wrong type
- Gun not triggered
- Fill the tank with gasoline and open fuel shut
off valve.
- Check fuel line to carburetor.
- Add oil to proper level.
- Move switch to START position.
- Drain fuel tank and carburetor. Use new fuel,
and make sure spark plug is dry.
- Open choke, and crank engine several times
to clear out gas. Make sure spark plug is dry.
- Remove and clean.
- Clean spark plug, adjust the gap, or replace.
- Trigger gun while starting engine.
Engine not operating properly
or lacking power
- Partially plugged air cleaner filter
- Spark plug dirty, wrong gap, or wrong type
- Remove and clean.
- Clean spark plug, adjust the gap, or replace.
Pressure too low and/or pump
running roughly
- Worn or wrong size nozzle
- Inlet filter clogged
- Worn packings, abrasives in water, or natural
wear
- Inadequate water supply
- Belts slipping
- Fouled or dirty inlet or discharge valves
- Restricted inlet
- Worn inlet or discharge valves
- Leak in high-pressure hose
- Replace with nozzle of proper size
- Clean filter. Check more frequently.
- Check filter. Replace packings.
- Check water flow rate to pump.
- Tighten or replace belts; use correct belts, and
replace both at same time.
- Clean inlet and discharge valve assemblies.
Check filter.
- Check if garden hose is collapsed or kinked.
- Replace worn valves.
- Replace high-pressure hose.
Water leaking from under
pump manifold
- Worn packings - Install new packings.
Water in pump oil - Humid air condensing inside crankcase
- Worn packings
- Oil seals are leaking
- Change oil as specified in Maintenance
chapter.
- Install new packings.
- Install new oil seals.
Packings failing frequently or
prematurely
- Scored, damaged, or worn plungers
- Abrasive material in the fluid being pumped
- Inlet water temperature too high
- Over pressurized pump
- Excessive pressure due to partially plugged or
damaged nozzle
- Pump running too long without spraying
- Running pump dry
- Install new plungers.
- Install proper filtration on pump inlet plumbing.
- Check water temperature. It should not ex
ceed 140°F (60°C).
- Do not modify any factory-set adjustments.
- Clean or replace nozzle. See Nozzle Connec-
tion in chapter C.
- Never run pump more than 3 minutes without
spraying.
- Do not run pump without water.
Strong surging at inlet, and low
pressure on discharge side
- Foreign particles in the inlet or discharge valve,
or worn inlet and/or discharge valves
- Clean or replace valves.
No detergent is being siphoned
into system
- Incorrect nozzle installed
- Pressure too high
- Worn chemical injector valve
- Install chemical/detergent nozzle
- Adjust pressure to lowest point
- Install new chemical injector valve
Pressure drop - Air in the system.
- High-pressure nozzle blocked/worn.
- Pressure control on the lance is not set correctly.
- Engine speed too low.
- Vent the system by operating the spray gun
several times at short intervals. If necessary,
dismount the lance (see section C6).
- Clean/replace the high-pressure nozzle.
- Set the required working pressure.
- Contact Nilfisk Service Department.
In suction mode - Lack of water because max. permissible suction
height has not been heeded.
- Pump draws in air (only possible in suction
mode).
- Flood the hose - More info see chapter D.
- Check that the suction set is air-tight. Repeat
aeration.