| Belts and tensioning [message #133549] |
Wed, 06 July 2011 18:36  |
Andrew
Messages: 213
Registered: April 2011
Location: Connecticut
Karma:
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Senior Member |
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I just replaced my power steering pump, and associated hosery.
I was putting the belts back and noticed that I have two belts on the power steering pump (double pulley), and the same on the alternator. In fact, the two belts follow exactly the same path (crankshaft-fan-alternator-pspump) and are the same model number (Gates 7570 XL). They were installed a few weeks ago when the coach was in the shop for major suspension surgery.
Is this a modification? Possibly to get more bite on the power steering pump pulley? The docs I can find say that the power steering pump should have a 7450 belt, but that would imply that it would follow a different path too, right?
The third belt (Gates XL 7619) goes to the A/C compressor, and appears normal.
The other problem I'm having is that one of the 7570s is looser than the other (3/4" deflection), and is slipping. I can't tighten it further because the tighter one is ...well, tight. I don't want to damage anything (alternator, pspump), and it's at the limit of my two-handed tensioning abilities. I haven't tried swapping the belts to see if the looser one got stretched on the drive home...should I? Or is something bigger wrong?
The Gates belts are the narrow ones, and I've already bought a replacement set from NAPA for when they fail, but I'm not ready to blame them for the problems yet.
Would a belt tensioner be a worthwhile purchase?
1973 Sequoia 260 (since 2011)
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