I have assembled new bearings in my NP200 transfer case on my 55 PW. The 15 to 30 inch pound torque called in the manual for the driven gears assemblies seems a bit tight to me . Is this best held on the low end of the spec?
Announcement
Collapse
No announcement yet.
Transfer case bearing adjustment
Collapse
X
-
Originally posted by John SI have assembled new bearings in my NP200 transfer case on my 55 PW. The 15 to 30 inch pound torque called in the manual for the driven gears assemblies seems a bit tight to me . Is this best held on the low end of the spec?
-
I'm dredging up threads from way in the past here, but I was setting up the bearings in my t-case last night and couldn't get the pre-load within the 15-30 in. lb. spec.
Closest I could get was about 35 in. lbs. or so. I assume this should be OK, but wanted to make sure before I bolt it all together for the last time.
Comment
-
I've tried setting it up about a dozen times now and just can't seem to get within the 15~30 range. I'm either a little below 15 or a little above 30.
The older instructions in my WDX manual say dry but both the M37 and later PW manuals say with lube.
My original tries were dry, I just tried adding lube but that didn't seem to change it much if at all that I could tell.
Comment
-
Originally posted by Desoto61 View PostI've tried setting it up about a dozen times now and just can't seem to get within the 15~30 range. I'm either a little below 15 or a little above 30.
The older instructions in my WDX manual say dry but both the M37 and later PW manuals say with lube.
My original tries were dry, I just tried adding lube but that didn't seem to change it much if at all that I could tell.
Comment
-
I'll have to see if I can get some thinner shims then, because none of my combinations would let me get there, the thinnest shim I have though is .008 in. But .043 is too tight and 0.047 is just a little too loose, and I can't seem to get a value in between with the shims I have.
I initially set them up dry per the WDX manual but after looking at the military manual (and the later PW manual here) I lubed the bearings and re-checked the values, they didn't seem to change much that I could tell, at least not enough to make the difference I needed.
The rear axle bearing support is right at about 25 in. lbs. so that's good.
I imagine the idler shaft should be set up to the same spec, though there's not real way to measure the torque other than a calibrated hand. The manual says a "slight drag".
Comment
-
Originally posted by Desoto61 View PostI'll have to see if I can get some thinner shims then, because none of my combinations would let me get there, the thinnest shim I have though is .008 in. But .043 is too tight and 0.047 is just a little too loose, and I can't seem to get a value in between with the shims I have.
I initially set them up dry per the WDX manual but after looking at the military manual (and the later PW manual here) I lubed the bearings and re-checked the values, they didn't seem to change much that I could tell, at least not enough to make the difference I needed.
The rear axle bearing support is right at about 25 in. lbs. so that's good.
I imagine the idler shaft should be set up to the same spec, though there's not real way to measure the torque other than a calibrated hand. The manual says a "slight drag".
Comment
-
Originally posted by Desoto61 View PostOk, I ordered a shim kit (McMaster-Carr PN 3088A939) that has shims as thin as .001, so I should be able to get it dialed in as soon as that arrives.
Thanks for the help.
Comment
-
They have the same ID as the bearings with a slight positive tolerance which is close to the ID of the OE shims I measured, the OD is a little bigger than the OE shims but not by much, and thickness runs from .001" to .125". I ordered multiple sets so I should have enough for both the bearing support and the idler gear setup.
Comment
-
That did the trick. Shims came today (McMaster-Carr is really fast). I set up the bearings at 0.043" and checked the torque. It was too high, so I added a 0.002" shim put the assembly back together and ended up with about 24 in. lbs. running torque. Thanks for the help.
Comment
Comment