66
GB 14 07 01
Maintenance
T191-0009
T191-0010
1000 hour
1000 hour
1000 hour
1000 hour
1000 hours ser
s ser
s ser
s ser
s service
vice
vice
vice
vice
1. Wheel bearings and br
1. Wheel bearings and br
1. Wheel bearings and br
1. Wheel bearings and br
1. Wheel bearings and brak
ak
ak
ak
akes
es
es
es
es
Check the condition of the bearings and brake wear
parts in the following way:
1. Place stop wedges in front of and behind LH wheel
and jack up RH wheel.
2. Support the trailer with axle stands.
3. Remove the wheel.
4. Remove the hub cap
A
, cotter pin
B
and castle nut
C
.
5. Pull off the wheel hub and brake drum assembly. Use
a wheel puller if necessary.
6. Vacuum clean the brake drum
D
for brake dust or
rinse with water.
WARNING!
Brake dust can cause severe health
injuries! Avoid inhalation of brake dust! Use
respirator when servicing the brakes. Do not clean
brakes with compressed air! Use vacuum cleaner or
rinse with water to avoid brake dust being blown around.
7. Rinse the remaining parts on the brake carrier plate
with water and dry them.
8. Remove roller bearings
E
, clean all parts in
degreasing detergent
and dry them.
9. Check the brake drum
diameter and lining
thickness - renew if worn.
Max. wear rates on brake components, mm (in)
Model
2200/2800
3200/4200
Max. drum diameter
A 302 (11.8897)
402 (15.8388)
Min. lining thickness B 2.0 (0.07874)
4.0 (0.15748)
IMPORTANT!
The specified min. thickness is the
absolute minimum which must never be exceeded.
Renew the parts if they would reach the above dimen-
sions before next service inspection.
IMPORTANT!
Renewal of brake linings or brake drums
must be done both sides at the same time.
NOTE!
If the brake drum must be removed from the
hub, a hydraulic press is required to press the wheel
studs out.
10.Remove the clevis pin between the air diaphragm
cylinder and brake cam lever.
11.Remove the cotterpin
G
and nut
F
, the brake shoe
anchor bolt
H
and slide the brake shoes over the
cam. Twist the pair of brake shoes to remove the
shoe return springs
I
. Replace brake shoes if the
linings are worn.
12.Apply a small qty. of copper paste on moving parts
and assemble the brake shoes and shoe return
springs again.
WARNING!
Do not get oil, grease or copper paste
in contact with the brake linings and drums.
13.Fit the shoe assembly with the anchor bolt first. Then
pull the shoes away from each other and slide them
over the cam afterwards. Tighten the anchor bolt
castellated nut again and fit a new cotter pin.
14.Check roller bearings for discoloration and wear -
renew if worn or damaged.
15.Assemble the hub and bearings using a new sealing
ring
J
.
16.Fill the hub and bearings with fresh grease before
fitting it to the shaft.
17.Fit the castellated nut. Rotate the hub and tighten the
castellated nut until a slight rotation resistance is felt.
18.Loosen the castellated nut again until the first notch
is aligned with the cotter pin hole in the shaft.
NOTE!
The shaft has a vertical and an horizontal cotter
pin hole. Use the one first aligned with the notch when
loosening the castellated nut.
19.Fit a new cotter pin and bend it.
20.Fill the hub cap with fresh grease and carefully press
it on to the hub.
21.Adjust the brakes as described in 200 hours serv-
ice.
22.Fit the wheel again and tighten the wheel nuts. See
section 50 hours service regarding torque wrench
setting.
Tighten all bolts to half the specified torque first, then
to the full specified torque.
23.Tighten again after 10 hours of work. Check the
torque every day until it is stabilised.
WARNING!
If you do not feel totally confident
changing wheel bearings or brake shoes contact
your HARDI dealers workshop.
T191-0006
T191-0007
T191-0008