Standpipes – Spicer Convertible Tandem Axles User Manual
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Lubrication
Standpipes
Drive axles are lubricated with oil drawn from a large sump
integral to the assembly. Most axle designs attempt to posi-
tion vital components such as pinion bearings in close prox-
imity to this sump, keeping them bathed in a generous supply
of oil at all times.
When drive axles are installed at severe angles in vehicle
chassis, the position of these components is changed relative
to the oil sump. The same effect is present when the vehicle
travels up a steep grade. Oil in the sump remains level while
the axle itself tilts up or down. This makes it possible for bear-
ings and gears located well forward in the assembly to
“starve” for lubrication even though the axle is filled to the
base of the fill plug hole as recommended by the manufac-
turer.
Axles should be modified with standpipes to raise lube levels
whenever chassis installation angles exceed 10° and when the
vehicle must negotiate continuous or lengthy grades on a rou-
tine basis.
The chart gives standpipe recommendations for vehicles
operating in consistently mountainous areas.
*Does not allow for standpipe.
Capacities do not include wheel equipment requirements.
An additional 1-2 pints is required in each wheel hub.
*Does not allow for standpipe.
Capacities do not include wheel equipment requirements.
An additional 1-2 pints is required in each wheel hub.
*Pinion pointing upward
S170
Axle Installation
Angle
Axle Location
Quantity
(pints)
12°
Rear
29*
10°
Rear
30*
8°
Rear
31
6°
Forward
Rear
39
32
4°
Forward
Rear
41
33.5
2°
Forward
Rear
43
35
0°
Forward
Rear
45
36
S190
Axle Installation
Angle
Axle Location
Quantity
(pints)
12°
Rear
29*
10°
Rear
30*
8°
Rear
31
6°
Forward
Rear
42.5
32
4°
Forward
Rear
44.5
33.5
2°
Forward
Rear
47
35
0°
Forward
Rear
50
36
Tandem Forward Axles
Installation
Angle*
5-10%
Grade
10-15%
Grade
15-20%
Grade
0°
–
–
–
3°
–
–
2.00"
5°
–
1.00"
2.25"
7°
–
1.25"
2.50"
10°
1.50"
1.75"
2.75"
13°
1.75"
2.00"
3.00"
15°
2.50"
2.50"
3.25"