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Re: Finally, someone who knows transmissions
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Posted by CMyles [Email] (#1126) [Profile/Gallery] (more from CMyles) on Sat, 11 Aug 2007 19:00:15 Share Post by Email
In Reply to: Finally, someone who knows transmissions, No Snaab, Sat, 11 Aug 2007 06:45:11
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Nosnaab,
An accumulator provides for the gradual application of a friction band or plate type clutch. The idea is to "slip the clutch" in the same way that we lift the clutch pedal slowly when shifting gears in a car with a manual transmission. When an automatic transmission accumulator fails the associated friction plates or band will be instantly and harshly applied similar to popping the clutch with a manual transmission. This action will damage the thin friction material and eventually cause clutch failure. The 1-2 accumulator is in the front band apply circuit so damage to that band would be expected. Like most automatic transmissions, replacement of any of the friction elements, band or drum, requires removal and disassembly of the transmission, so fixing the malfunctioning accumulator promptly is advisable.
Other things can cause harsh engagement including a badly worn band. When the friction material wears off the spring steel band grabs the rotating steel drum like worn out brake pads grab a brake rotor and the drum gets chewed up. There will often be an interval during the wearing out process when the band grips the drum abruptly even though the accumulator has done it's job properly. Typically these (BW type 37) transmissions shoot craps at about 150,000 miles (emphasis on TYPICALLY). If your T37 has that kind of mileage you are likely to have developing problems beyond just a bad accumulator o'ring (just so you know). Inspecting the 1-2 accumulator is about twice as much work as changing the tranny filter if you're inclined to DIY. Big ATF mess, easier done on a rack. Removing and refitting the little oil pipes can be very taxing for first timers. Cheers.

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