Electrics Section T
Figure
19
Windscreen w iper motor
1 Wiper
mot
or
2 Rack
3 Pad
6 Washer
7
Nut
8 Wheelbox
11
Bundy. overrun
1 2
Wip
er arm
an
d blade
13
Wiper arm
21
4 Strap
5 Coachwasher
9 Bundy.
wheelbox to wheelbox
1 0
Bundy
. motor to wheel box
14 Wiper
blade
vehicle above the passenger footwall, is
of
the
single speed type incorporating a self-switching
power unit,
which
drives
two
wheelboxes
by
means
of
a flexible cable rack running through
rigid bundy tubing.
Routine
maintenance
To ensu
re
efficient
wiping
keep the bla.des in
good
condition. The windscreen should be kept
clean at
all times
to
prevent possible scratching
due
to
deposits
of
dust, etc. Oil, tar spots,
or
similar deposits should be removed from the
windscreen
with
methylated spirits. Silicone
or
wax
polishes must
not
be used.
An
unsatisfactory action
or
complete failure to
operate may be caused by a mechanical or
electrical fault, the symptoms and remedial
procedure being described
as
follows:
(a)
Mechanical
Badly kinked
or
flattened cable rack tubing
will
prevent the rack from turning freely, thus
preventing
or
restricting the operation
of
the
wheelboxes and wiper arms. The tubing must be
reformed
or
replaced having a radius
of
no
less
than 228mm
(9
·0in). Check the wheelbox
spindle
for
freedom
of
rotation, a seized
unit
or
one having damaged teeth must be replaced.
(b)
Electrical
Check that the wiring connection is secure in
the limit
switch
on the
wiper
motor
to
ensure
the voltage supply is adequate. A delay
or
complete failure
of
the
wiper
blades
to
operate
could be caused by a faulty
wiper
switch located
on the fascia. A
new
one should
be
fitted
to
confirm this.
If
all the other electrical and mechanical
components have been found to be functioning
co
rre
ctly and the wiper system still fails
to
operate, a faulty motor is indicated and a
replacement
unit
must be fitted.
To
remove
wiper
motor
(see
Figure
19)
1 Prise the
wiper
blades from the wheelbox
splined drive spindles.
2 Disconnect wiring plug from
wiper
motor
limit switch.
3 Disconnect cable
ra
ck tubing at
wiper
motor union.
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