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NC Wayne
03-16-2007 20:07:28
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Re: Hydraulic Excavator RePower in reply to uncle, 03-16-2007 18:48:10
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Hey Brian, glad to help and that the manual will be useful. As for the engine swap the problem will be the lack of HP on the 3-53 vs the 4-53. According to the manual the 4-53 is producing 108 HP at 2410 RPM. Going by the data in the Detroit Field service book a normaly aspirated 3-53 is gonna produce, at most, 79 HP at 2400 RPM. With a turbo you could get 120 continious out of the 3-53 at 2400 but without it your pretty well stuck at 79 HP at the given RPM. That's nearly a 30 HP difference which is gonna be huge given the fact that the three pumps used are positive displacment type. With three pumps each capable or producing 37 GPM at 2500 PSI and using an 80% efficiency, that actually works out to need nearly 130 HP. The way their arranged, (one for the boom, one for the dipper, and one for the bucket and swing combined) your typically not gonna be using all three pumps, at rated pressure, at all times, so that gives a little leway on the HP needed hence being able to use a 108 HP engine vs a 130 HP engine. However when digging in hard ground it's not gonna be uncommon to be using at least two of the circuits at rated pressure (ie-the dipper and bucket). In that case your looking at 74 GPM at 2500 PSI. The HP needed in that case, again only figuring 80% pump efficiency is 86HP. This is still 7 HP more than what your gonna get out of the highest rated, non turboed 3-53. About the only way you could manage a swap like this without killing the engine every time you got in to hard digging would be to lower the hydraulic pressures into the 1500 PSI range which would drop the required HP back to about 77. I didn't get that involved in reading the manual to know how the pump flows are used when tracking the machine but even using only two pumps, one for each track, if you hit any kind of a grade/obstruction and the pressure rose the needed HP, again, would kill the smaller engine. In other words, bad as I know you hate to hear it, doing a swap and loosing so much HP isn't gonna work without absolutely killing the machines performance. Check out the link to Heartland----Click on Publications--Construction--Parts Connection. You can probably find a good running 4-53 takeout somewhre for a decent price. You'd probably have to skirt it with the parts particular to your machine but it'd be cheaper than a rebuild. Good luck and let me know how it turns out.
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