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HINTS ON MAINTENANCE.

29th April 1924, Page 28
29th April 1924
Page 28
Page 28, 29th April 1924 — HINTS ON MAINTENANCE.
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How to Get the Best Out of a Vehicle, to Secure Reliability and to Avoid Trouble.

512.—Replacing a High Speed Pinion on the Foden.

The _Peden speed gear includes a doeble gear built up from two pinions held together by means of mild steel rivets. It is important that this should be known because the high-gear pinion, which is more often used, wears out before that for the low speed, and cases have been known where the complete double gear was scrapped when only one pinion was worn.

A new high-gear pinion, complete with rivets, may be bought from any Foden agent. To fit this. the worn pinion must be removed, using a drift to knock out the rivets, although sometimes these have to be partially drilled out beforehand with a half-inch If the sliding gear is slack on the keys, oversize keys may be employed. If the wagon has been much used, this repair has geobably been carried out previously, in which case the slotting of new keyways in the pinion is recommended. When this has to be done a cap should be riveted at the end of the pinion to cover up the original keyways, and this cap may be slotted at the same time as the pinion. It should be held in position by at least two countersunk-head setscrews.

513,.—Taking Up End-play in the Dennis Gearbox.

If the main shaft in the gearbox of a Dennis subsidy-type lorry develops end-play and it is discovered that the adjusting button situated in the constantmesh pinion has become seized and cannot be removed, it is usually considered necessary to have the button turned Or drilled out.

In order to save time and expense, the following hint may prove useful. First, push the foot-brake drum backwards and forwards to determine the exact amount of the end-play. Now obtain an ordinary i-in. B.S.F. setscrew, file the head down to a thickness a trifle under the extent of the play, case-harden the head thus formed and screw it flush with the button in the constant-mesh pinion which, it will be found, is already tapped with the same thread.

$44

514.—The Cause of Erratic Ammeter Readings.

If the ammeter fails to register or registers erratically, this is a sign that something is radically wrong a,nd the fault will probably be found under one of the following headings :—Faulty connections causing a bad contact or no contact at all; oil on the dynamo commutator ; sticking of the dynamo brush in its holder, or wear on the brush so that it does not press on to the commutator ; a broken or Blipping driving belt on the dynamo ; a short circuit in some part of the equipment.

It should be remembered that the ammeter gives no indication of the condition of the accumulators.

515.—Improving Built-up Radiators.

In those types of radiator built up with tubular block centres, headers and bottom tanks, trouble is sometimes experienced owing to loosening of the setscrews which secure these tanks to the side supports. When this occurs, considerable stress is thrown on to the tubes and may cause leakages . where the tubes are soldered into the top and bottom plates.

The trouble is apparently caused by the 'fact that the flexion of the chassis frame tends to throw the radiator out of square; this causes a pull on the setscrews, and as these are considerably harder than the aluminium in which they are held they eventually' become slack in the threads.

In a recent case of this type which occurred, the expedient of inserting spring washers under the screw heads was first adopted, but as this proved useless the setscrews were finallY removed and replaced by fin, rods, which were carried the full length of the sides and secured to the tanks by being threaded at each end and fitted with nuts and spring washers. In order to fit these rods, the webs of the sides had to be cut away slightly and the holes in the tanks drilled out to suit the rods in the manner illustrated.

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