Thwaites SPRITE NIMBUS, Руководство пользователя

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CHAPTER 1 - DRUM BRAKE AXLE - SPRITE/NIMBUS MODELS.
TO REMOVE AXLE COMPLETE FROM DUMPER:
First remove the axle from the machine using the procedure described in the
manufacturers service manual. Next, thoroughly clean the exterior of the unit, thus
rendering the working conditions more suitable, in addition to ensuring that the
inside of the axle shall be kept clean. Carry out all stripping and re-assembling under
clean conditions, since inclusion of foreign matter in the axle could easily lead to
failure of the gears and bearings. It is not essential to remove the unit from the
machine if the work is limited to removal and replacement of an axle shaft or shafts.
AXLE SHAFTS, TO REMOVE AND REFIT:
To remove an axle shaft, the following procedure should be carried out:-
1. Remove the road wheel, brake drum and hub. The hub should be withdrawn with a
suitable extractor, after removing the axle shaft, nut, washer and split pin. See Fig. 2.
2. Check the end-float of the axle shaft with the dial indicator assembly, (See Fig. 1),
the correct tolerance for axle shaft end-float is shown on Chart 1.
3. Remove the brake back plate retaining bolts, the outer oil seal assembly, the hub
bearing retainer plate (if fitted) and the brake back plate, taking care not to lose or
damage any of the hub bearing adjusting shims which control the shaft end float.
4. Remove the axle shaft with its taper roller bearing using the Service Tool.
4a. To remove a broken axle shaft, make a loop at one end of a length of stiff wire, slide
the loop down the axle tube and over the broken end of the shaft for a sufficient
distance so that on pulling the loop will bind on the shaft and withdraw it from the
differential side gear. This applies where sufficient shaft remains (i.e. minimum
length 6").
4b. To remove a broken axle shaft with the break close to the spline, it is necessary then
to withdraw the opposite shaft and remove the differential assembly complete, i.e.
follow the instruction conveyed in paragraphs 3 and 4.
5. Examine the shaft oil seal which is pressed inside the axle tube, and if necessary
withdraw same and replace with a new seal.
6. Examine the hub bearing, and if replacement is necessary, the cone may be
withdrawn from the shaft by means of the extractor tool with suitable adaptor.
7. Fit the replacement bearing (if required) making sure that the cone is pressed
squarely on the bearing diameter until it firmly abuts against the shoulder provided.
If the bearing is not pressed home, it will creep in service, resulting in excessive
shaft end-float, which will damage the surfaces due to hammering.
7a. Where an abutment shoulder is not provided for the bearing, as in the case of
certain of the HA and 3 HA models, the bearing has a taper bore and should be
pressed on with the specified steady load of two tons.
3-1-1