1
Type
of
Problem
Dlagnoslng
clrcult board
indlcator lamps.
The normal
condition is red lamp
on,
telling pump
to
run.
clear lamp
on
when board is
Follow
Pressure Rellef Pro-
gun from hose. Remove
cedure Warning.
Remove
pressure control cover and
check for faulty condRion of
circuit board lamps.
Condltlon A
Both lamps on; pump
won't
operate and motor
is notrunning
What to Check
I
What to
Do
If
check
is
OK,
go
to
the next check
1.
Check leads from bridge
308)
to
motor
to
be
sure they are securey
I
fastened and
1.
properly maied.
2.
CheckGlandG2connectionsbetweencir-
tions and terminals. See page 32.
or loose terminals.
3.
3. Check for loose motor brush lead connec-
cuitboard (72)and bridge(308)fordamage
2.
4.
CheckbrushlengthwhichshouldbelOmm
minimum. See page 32.
NOTE
The brushes do
not
wear at the
samerateonbothsidesofthemotor.Check
4.
both brushes.
5.
Check for broken or misali ned motor
brushsprings.Rolledportiono?springmust
rest squarely on top of brush. See page 32.
6.
Check motor brushes for binding in brush
6.
holders.
See
page 32.
5.
7.
Checkmotorarmaturecommutatorforburn
spots,gougesandextremeroughness.Re-
7.
move motor cover and brush inspection
8.
plates
to
check. See page 32.
8.
Check motor armature for shorts using ar-
maturetester(growler)orperformspintest.
See page
17.
9.
Check bridge (308) by substituting with a
page18or21.
good bridgeor performing bridgetest. See
CAUTION:
Do
not perform this check until ar-
mature is determined
to
be good.
A
bad ar-
mature will immediately burn
out
a good
bridge.
9.
If
check
is
not
OK,
refer
to
this column
leads. Be sure male terminal blades are
Replace any loose terminals and crimp
to
straight and firmly connected
to
mating
Dart.
Cleancircuitboardmaleterminals.Replace
loose or damaged terminals. Securely re
Tightenteflinalscrews.Replacebrushesii
connect leads.
leads are damaged. See page 32.
Replace brushes.
See
page 32.
Replace spring
if
broken. Realign spring
with brush. See page
32.
Clean brush holders. Remove carbon with
Smallcleanin
brush.Alignbrushleadswith
slot in brush
1
older
to
assure free vertical
brush movement.
Remove motor and have motor shop resur-
face commutator
if
possible. See page 30.
Replace motor. See page
30.
Replace bridge. See page 21.
.
swmn
12
307-689
To Next Page
Loading...
