Spicer Speciality Axle Division - Technical Publications
OVERHAUL INSTRUCTIONS FOR TYPE 1S REAR DRIVE HUB
WITH KIRKSTALL 151/2" x 6 " BRAKE
Viton 'O' rings and seals (flouro-elastomers) - safety hazards.
It has been brought to our attention that 'Viton' material used in manufacture of oil seals and 'O' rings,
produces a highly corrosive acid (hydroflouric) when subjected to temperatures above 315° C.
The resulting contamination can have extreme consequences on human tissue since it is almost
impossible to remove after contact.
We therefore recommend the following procedure when it is necessary to inspect any equipment that
has been subjected to a high temperature i.e. fire.
Visually inspect for any gaskets or seals which have suffered from heat ; they will appear
black and sticky.
If this is affirmed :- Do Not Touch.
Any flouro-elastomer (Viton, Flourel or Tecmoflon) should be considered dangerous but
natural rubber and nitrile are non-hazardous.
If flouro-elastomer seals have been used, then the affected area MUST be
decontaminated before undertaking further work.
Disposable heavy duty gloves (neoprene) MUST be worn and the affected area
decontaminated by washing thoroughly with limewater (calcium hydroxide solution).
Any cloths, residue and gloves used MUST be safely discarded after use.
Burning of the discarded items is NOT RECOMMENDED, except in an approved
incineration process where the gaseous products are treated by alkaline scrubbing.
DRAINING THE OIL
Before attempting to remove road wheels, drive vehicle onto a level concrete floor, preferably after a
short run to warm the oil.
Chock road wheels left on ground and apply parking brake.
Loosen, but do not remove wheel nuts (1).
Jack up vehicle and support on axle stands.
Remove wheel nuts (1) then pull off road wheels.
Rotate hubs in turn to bring planet drain setscrews (82) to their lowest position .
Place drip trays under hubs (approx. capacity - 2 pints : 1.15 litres) and drive head unit
(approx. 15 pints : 8.6 litres ] then remove planet level plugs and washers (83 & 80) followed by planet
drain setscrews with washers (82 & 81) to drain oil from hubs.
Similarly remove drive head filler and drain plugs to drain oil from drive head.
When axle is completely drained of oil remove drip trays and dispose of old oil.
DISMANTLING PLANET CARRIER UNIT
Remove planet carrier setscrews and washers (82 & 81) then insert two of setscrews into tapped holes
provided in planet carrier flange (79) and tighten evenly to draw planet carrier assembly from hub (20).
Remove and discard planet carrier 'O' ring (78).
Inspect planet carrier dowels (19) for wear / damage and drive out for replacement if required.
Remove a planet pin collar setscrew (3) then prise out collar with 'O' ring (4 & 5). Discard 'O' ring.
Knock planet pin (12) inboard with soft metal drift to remove, taking care not to damage setscrew hole
Lift planet gear (9), complete with needle rollers (7 & 10) and spacer (8) taking care not to lose any of
needle rollers. Separate gears from rollers and spacer.
Remove planet gear thrust washers (6 & 11) from planet carrier (78).
Repete operations 2.4 to 2.7 for other two planet gear assemblies.
Manual No. 1785 Issue A
© Spicer Speciality Axle Division