Warning, St-45hrm ce concrete pump — braking system, 0 wheel hub assemblies 5.1 inspection – Multiquip Mayco Structural Concrete Pump ST-45HRM CE User Manual
Page 46: Wheel hub assemblies with taper roller bearings
PAGE 46 — MAYCO ST-45HRM CE PUMP — OPERATION & PARTS MANUAL — REV. #0 (02/23/04)
5.0
WHEEL HUB ASSEMBLIES
5.1
INSPECTION
Ensure the brake shoes (if braked) are clear of the drum with no
interference. Clean the hub to remove any road debris.
Rotate the hub slowly – there should be no roughness or
restriction.
Rotate the hub rapidly – There should be no rumble, rattle or
high-pitched noises.
Rock the wheel while holding at the top and the bottom to detect
essential bearing endplay. The maximum movement should be
2mm, measured at the wheel rim.
If any clearance or free movement appears to emanate from the
suspension, check the axle housing for damage.
WHEEL HUB ASSEMBLIES WITH TAPER ROLLER
BEARINGS
In order to re-set, remove the grease cap, split pin and set the
slotted nut. See Figure 45.
It is generally accepted that a finger tight slotted nut, will result in
a correct setting and running clearance for normal bearing life.
Always replace the split pin with a new one when setting is
complete and re-fit the grease cap.
WARNING
It is our experience that the majority of
bearing failures are the result of over-
tightening of the slotted nut or failure to
replace contaminated grease (e.g.: water
ingress – especially salt water).
Figure 45. Grease Cap, Split Pin
and Slotted Nut Removal
The wheel bearings are greased on assembly at the factory and
should be re-greased at a minimum every 38,624 km (24,000
miles) or 2 years with axle grease “ELF Multi 2” or equivalent.
Use the service interval to inspect the bearings for wear/damage.
Replace the seal if necessary, lubricating the lip and bore, not
the outside diameter.
WARNING
It is as important not to OVERPACK the hub
with grease, as it is to allow bearings to run
dry.
REMOVAL OF HUB/BRAKE DRUM ASSEMBLY
Remove the wheel, grease cap, split pin, slotted nut, and washer
and pull the drum off the stub axle. To avoid contamination, take
care not to drop the outer bearing cone onto the floor.
5.4
WHEEL HUB ASSEMBLIES WITH UNIT BEARINGS
These hubs require no maintenance, however at intervals of
38,624 km (24,000 miles) or 12 months, the wheel hubs should
be checked for side play and the complete hub replaced if
necessary.
WARNING
When refitting the hub, always fit a new nut
and tighten to a torque of 280Nm (206lbf.ft.)
5.5
WHEEL NUT / STUD TORQUE SETTINGS
S
G
N
I
T
T
E
S
E
U
Q
R
O
T
D
U
T
S
/
T
U
N
L
E
E
H
W
.
9
E
L
B
A
T
s
t
u
N
l
e
e
h
W
m
N
t
f
.
f
b
L
.
n
i
M
.
x
a
M
.
n
i
M
.
x
a
M
F
N
U
.
N
I
2
/
1
t
u
N
l
e
e
h
W
0
7
0
1
1
0
5
0
8
F
N
U
.
N
I
8
/
5
t
u
N
l
e
e
h
W
5
3
1
0
6
1
0
0
1
0
2
1
5
.
1
X
8
1
M
t
u
N
l
e
e
h
W
5
4
2
0
0
3
0
8
1
0
2
2
s
d
u
t
S
l
e
e
h
W
5
.
1
X
2
1
M
d
u
t
S
l
e
e
h
W
5
6
0
9
0
5
5
6
5
.
1
X
4
1
M
d
u
t
S
l
e
e
h
W
0
2
1
0
5
1
0
9
0
1
1
ST-45HRM CE CONCRETE PUMP — BRAKING SYSTEM