Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 49 / 82

FORM NO. 56043129 - SR 1900 - 49
SOLUTION SYSTEM
TROUBLESHOOTING GUIDE
Troubleshooting Guide
Symptom
Misting Pump will not Work
Part A: Electrical Control Circuit
Note 1: Do all testing with the key switch ON, misting solution tank not empty, main broom
lever lowered, drive pedal activated in Fwd or Rev and the M4 misting pump’s control switch
S26 turned ON.
Note 2: Before T.S.check the continuity of the pump’s circuit breaker CB 7 (10A), reset or
replace if defective.
Misting Pump will not work
Test continuity of
the Brn/Blk wire.
Test continuity of the
S26 misting pump
relay switch. Does
switch test good ?
Replace the S26
misting pump
relay switch
Test for 12V’s @ the K6
misting pump coil relay wires
(+ Blu/Orn & - Brn/Blk).
Test for (+)12V’s @
the K6 Blu/org wire
to battery ground. Do
you have 12V’s
See section B electrical load
circuit for misting pump
Test for 12V’s Neg. @ the K6
Brn/Blk wire to battery (+)
Pos. Do you have 12V’s ?
Replace the A2
control box Assy.
Repair or
replace Vio
wire
Repair or
replace the
defective
Brn/blk wire
Test for 12V’s @ the
S26 SW, Vio feed
wire to battery GRD
Yes
Yes
No
No
No
Yes
No