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BRAKES
Section E
Note: the brakes operate on a mineral hydraulic fluid. On no account must a vegetable
based brake fluid be used otherwise all braking system seals will be damaged.
To gain access to the brake components it will be necessary to refer to Section D and
remove the axle arm assemblies.
Remove the brake friction and fixed plates from the sun gears and withdraw the sun
gears from the planet carriers.
Remove the brake spacer plates from within the axle arms and withdraw the brake
pistons from the cylinders located in the ends of the centre casing and discard the seals
even if visually in good condition. Ensure replacement seals are suitable for use with
mineral hydraulic fluids.
Refer to Section B and F if the brake cylinders require relacement.
Examine all parts for wear or damage, under normal operating conditions the brakes
should last several years, but should be replaced if blued, distorted or badly scored or the
wear exceeds the limits given below.
Blueing of the brake plates indicates that the brakes have been overheating and slipping.
Both sets of plates, plain and sintered bronze, should be replaced and the piston seals
renewed.
Distortion normally occurs in conjuction with blueing and again indicates that the brakes
have been overheating and slipping. Both sets of plates, plain and sintered bronze
should be replaced and the piston seals renewed.
Scoring of the plates indicates that there are loose particles or foriegn material
suspended in the oil. The axle casing should be thoroughly cleaned out and if necessary
the source of the particles or material should be investigated. Both sets of plates, plain
and sintered bronze should be replaced and the axle refilled with clean oil.
Wear, if the sintered groove of the bronze brake disc is worn down to a depth of .025
inch, 0.6mm or less, then the plates have reached the end of their working life and should
be replaced. Care should be taken when examining the plain brake plates for over a long
period of operation these can show a greater degree of wear than the sintered bronze
disc. Do not assume because the bronze disc is well within the wear limits that all the
brake plates are in an acceptable condition. Replacing the plain brake plates may
prolong the working life of the brakes and restone their efficiency.
Lubricate all the parts with one of the recommended mineral oils and carefully refit the
brake pistons taking care not to nip the “O” rings.
Refit the brake spacer plates into the axle arms and insert the sun gears into the
planetary carrier. Slide a friction plate over the planet carrier upto the brake spacer plate
followed by a plain fixed plate, locate the fixed plates on the dowels in the axle arms.
Slide on the next friction plate aligning the oil feed holes in the friction plates, followed by
a fixed plate (A plain fixed plate must be fitted between the last friction disc and brake
piston).
Refer to Section D and refit the axle arms.
Refit the drain plug. Remove the combined filler/level plug and top up the oil.