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Caterpillar DW15
Caterpillar DW15
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8 years 8 months ago #138745
by QuAD
Gilbert restore the tachometer of the DW15 and look not digital, but ancient solidity.
But we do have a question about this tachometer.
Why is there a lock ?
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8 years 8 months ago #138747
by Deas Plant.
Hi, Quad.
My guess would that the lock was to stop people getting into the tachometer and fiddling with the recorder needle that remains pegged at the highest revs recorded by the tacho. This arrangement was an early attempt to stop people over-revving these engines because doing so left a record via the position of that recorder needle.
Just my 0.02.
You have a wonderful day. Best wishes. Deas Plant.
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8 years 8 months ago #138765
by tctractors
I am still giggling over Dea's Burglar Proofing title, I have seen this years ago in 769 dumpers, no 1 had the key for the thing but a second hand inside the face would lock in place showing engine over speed at a pre set position, this I took to point to incorrect driving, at that time all the dumpers on the site had Prayer Brakes instead of air brakes due to no money to fix e'm, so they used to be loaded heavy and driven steady, so as already said Over Speed record, the dumpers had air start engines just thought I would say.
tctractors
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8 years 8 months ago #138777
by Kelly
Hi, Quad.
My guess would that the lock was to stop people getting into the tachometer and fiddling with the recorder needle that remains pegged at the highest revs recorded by the tacho. This arrangement was an early attempt to stop people over-revving these engines because doing so left a record via the position of that recorder needle.
Just my 0.02.
Back in the day most pull Skinner's (scraper operators) had tac key on their key ring.
Kelly
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8 years 8 months ago #138890
by Ray54
What a great find. That has been in the box about as long as I have been around.
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8 years 8 months ago #138912
by Paso Bob
Having a tach key was a must and I kept one on my key ring! Going downhill and you if started to bounce a little, the engine will surge and the tach needle will jump up higher then the actual RPM's. On one of the spreads I worked on that included ten 657's, the mechanics would check tachs at noon and quitting time. If the tattle tale was pushed off the peg, the operator went down the road.
D-4 7U-43159 with 4S dozer and Cat 40 scraper, D-7 3T-1179 with Cat 7S hydraulic dozer, D-7 17A 13,944, D-8 14A-1160 with Cat 8S cable dozer, Cat 12-99E-4433 Grader. All runners and users.
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Caterpillar DW15
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