Troubleshooting - Stihl RE 521 Manual De Instrucciones

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Troubleshooting

Before working on the machine, unplug the power cord, turn off the water supply and actuate the spray gun until the pressure has
been relieved.
Fault
Motor does not run when switched on
(hums when switched on)
Pressure fluctuates or drops
Machine runs erratically
1)
STIHL recommends STIHL servicing dealers
64
Cause
Power cord has not been plugged in, mains
voltage is too low or improper
Cross-section of extension cable is too small Use an extension cord with a sufficient
Mains circuit-breaker has been tripped
Spray gun not actuated
Shortage of water
High-pressure nozzle in spray head is dirty
High-pressure nozzle worn
Screens in intake of water tank or high-pres -
sure pump clogged
High-pressure pump is leaky, valve is
defective
High-pressure pump is taking in air from
empty detergent tank
Remedy
Plug the power plug into the wall socket
Check electrical connection
Check plug, cable and switch
cross-section, see "Connecting the
machine to the power supply"
Connect the machine without an exten -
sion cord
Switch off the machine, actuate the spray
gun until water only drips out of the head,
engage the safety catch, reset the mains
circuit-breaker
Actuate spray gun when switching on the
machine
Open water tap completely
Ensure a sufficient inflow of water (use
3/4" hose)
Clean high-pressure nozzle; see
"Maintenance"
Replace high-pressure nozzle
Clean screens; see "Maintenance"
Have the machine checked by a servicing
1)
dealer
Set detergent metering valve to minimum
setting, bleed air out of high-pressure
pump: To do this, remove the spray lance
and operate the spray gun until the air has
escaped
RE 521, RE 551 PLUS, RE 581, RE 581 PLUS