PREVOST H3-41 Maintenance Manual page 993

11.1 WIPER ARM
Check operation of the wipers for proper blade
sweep and angle.
CAUTION
Do not attempt to manually move the wiper
arms to make wiper blade sweep adjustments
as damage to the wiper linkage or motor may
occur. If it is necessary to adjust the sweep of
blades, remove the
adjustment by positioning the arms using
serration on the wiper arm pivot shafts.
11.1.1 Sweep Adjustment
On a dry windshield, to avoid possible damage
to the arm assembly or wiper motors, hold the
wiper arms away from the windshield by insert-
ing a small nail, or other such object, through the
holes at the base of each wiper arm specially
drilled for this purpose.
Sweep adjustment is a rough adjustment. It must
be followed by lower and upper linkage
adjustment. See paragraph 10.3 and 10.4.
In order to obtain the sweep adjustment, it may
be necessary to remove and reposition the wiper
arms, proceed as follows:
arms and make
SECTION 23A: ACCESSORIES - H3 SERIES
FIGURE 38: LOWER WINDSHIELD WIPER
1. Remove the cap nuts from the wiper arm
pivot shafts (Figure 38 & Figure 39);
2. Disconnect the windshield washer tubing at
the base of the wiper arm;
3. Lower windshield wiper: loosen the clamping
set screw securing the drive arm to the
knurled arm pivot shaft;
4. Remove the drive and idler arms or arm
assembly;
5. Relocate the drive arm or arm assembly on
its knurled pivot shaft to obtain the desired
position;
6. Lower windshield wiper. Tighten the clamp-
ing set screw to secure the drive arm to the
knurled shaft. Fit the idler arm onto the idler
pivot shaft.
TORQUE: 155-165 lb-in (18-19 Nm)
7. Install the pivot shafts cap nuts.
Drive arm pivot nut:
TORQUE: 20-24 lb-in (2.26-2.71 Nm)
Idler arm pivot nut :
TORQUE: 90-110 lb-in (10-12 Nm)
PA1621 Maintenance Manual All Series | Jan 2020
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