16 - FORM NO. 56043056 ConvertaMAX™ 20/26 / BA 550/650
SOLUTION SYSTEM
No
Yes
Yes
No
Yes
No
No
Yes
Yes
No
No
Yes
No
Yes
Solenoid will
not open, no
solution flow
(See Figure 3).
Verify scrub
brush(es) are
turning
See Brush System
Troubleshooting
Symptom 2 (part
A&B).
Separate the wiring
harness connector
that feeds the L1
solenoid (2 wires
Yel/Wht & Yel/Blk).
Test for 24V
Test the resis-
tance of the L1
solenoid coil. If it
reads infinity coil
is open or if it
reads 40 ohms or
less it is shorted
(a good coil
should read 63
ohms
±
10%).
Check for 24V
(Pos.) from the
Yel/Wht L1 harness
feed wire to a
(Neg.) battery
standoff
Replace the L1
solenoid coil if
testing shows it
shorted or open.
Check for 24V
(Pos.) at the
Blk/Yel input wire
on the S2 solution
switch
Test continuity of
the Blk/Yel & #12
wires from the K1
solenoid to the S2
solution switch.
Repair or replace
Replace the S2
solution switch
Check for 24V
(Neg.) from the
Yel/Blk L1 harness
feed wire to a (Pos.)
battery standoff
Check for 24V
(Neg.) at the
Vio/Blk input wire
on the S2 solution
switch
Replace the S2
solution switch
Check diode D2
for continuity in
one direction only
If diode checks
open replace the
D2 diode
Replace the L1
solenoid valve
TROUBLESHOOTING GUIDE ELECTRICAL
Possible Symptoms
1
Solution solenoid valve will not open when the solution switch is in the full on position.
2
Solution solenoid valve will not open when the solution switch is in the momentary on position.
SYMPTOM ONE
Note: Do all testing with the key switch on, brush switch closed (scrub deck lowered) and the drive paddle activated
(pushed Fwd or pulled into Rev).
revised 9/01
