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HINTS ON MAINTENANCE.

5th February 1924
Page 26
Page 26, 5th February 1924 — HINTS ON MAINTENANCE.
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Which of the following most accurately describes the problem?

How to Get the Best Out of a Vehicle, to Secure Reliability and to Avoid Trouble.

480.—Taking up Wear in the Trunnions of a Cast Aluminium Radiator.

Many of the radiators employed on commercial vehicles are mounted on the frame through the medium of trunnion bearings and trunnion arms, these arms usually being cast en bloc either with the bottom tank or the side brackets of the radiator.

To renew the complete casting in case of undue wear occurring on the trunnion arms is an expensive matter and can be avoided by turning the arms down and shrinking over them steel sleeves turned to suit the trunnion brackets. This, by doing away with slackness in the brackets, may save a lot of radiator trouble.

481.—Packing the Big-end Brasses on an Allchin Wagon.

When packing the big-end brasses of the wellknown Allchin steam wagon it is essential to keep the piston clearance at one end of the cylinder equal to that at the other ; even then, in some of the old models, there will sometimes be a knock when the engine turns over under steam at any considerable speed, as there appears to be rather too little. cushioning space for an engine propelling a wagon which is permitted by law to run at 12 m.p.h., and at times may possibly exceed this speed.

Such a state of affairs is unsatisfactory, but a cure can be effected by removing the trunk covers, both at the front and rear, and turning * in. from all four faces. If removing the stuffing-box trunks is too large a job, a compromise can be effected by turning off the other two (which are quite easy to remove) and replacing them with a good thick jointing material about * in. thicker than that usually employed.

All the big-end packing should then be placed between the wedge and brasses. This procedure has been found to stop all knocking and to make a very good improvement in the running of the machine..

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482.—Preventing the Gears in the Lacre Gearbox from Jumping out of Mesh.

The top and second-speed gears of the Lacre chassis are engaged by means of clog clutches, but it often happens that, after a vehicle has been running for a considerable time, these have a tendency to jump out, owing to their not being fully engaged through wear on the pins, strikers and thrust washers.

Of these three, the two former cause a loss of travel on the sliding dogs, whilst the wear on the latter allows the main driving pinion to alter its position.

Theoonly way in which to overcome this wear, if the makers' standard fitting be employed, is to fill up the hole in the drop arm and drill another hole farther from the centre. This is rather a ticklish job, as, if the hole be drilled too far from the centre, it will lengthen the travel of the sliding dogs to such an extent that it will be inaposgible to get the selector gear to travel the length of the gate and so fail to lock in the notches, as, although the gear rod is screwed for adjustment, lengthening or shortening this rod only -favours one gear at the expense of the other.

To overcome this trouble, the makers' fitting can be cut at the point indicated and a special piece brazed and pegged, or, preferably, welded into position. A special pin, which is prevented from rotating in the slide embodied in the new pattern end„ but which can be locked in any desired position, and a special screwed arm to replace that provided by the makers, are also required, and it will be found that by using these parts any travel desired may be obtained.

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