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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

Shim Packs

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Scott Green

01-26-2004 06:10:07

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We installed a new fork and throw out bearing assembly in oliver "880" tractor. The old ones were completly shot(lots of slop , along with one ear broken off). We can snap the over center clutch in and out , with the help of a couple crow bars. So we know it works. We can not do this with the actuall shifting type lever. Because the new parts have no slop , do you think I need to add more shims back in? Or are the shims for clutch wear only , and has nothing to do with bearing/fork ajustment? The manual say to have engine running , while testing the pounds it takes to engauge the power booster. The rest of the tractor has to be put back together before we can check the pounds. New shim packs are .147 thick. I have 10 loose shims under each spider. That's only .070. Any eperienced power booster people out there? One more question. Are shim packs still available? If so , where could a person buy them. Price I should expect to pay? Thanks , Scott

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D13

01-31-2004 18:25:56

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Re: Shim Packs in reply to Scott Green, 01-26-2004 06:10:07

Per the service manual the clevis is to adjust to keep the lever from hitting the dash.

Per the service manual,

Position the clutch plates and pressure plate and cover assembly in their correct positions in the clutch housing, but do not install the shims, fan segments, or retaining cap screws. Set the clutch assembly under a press and apply about 100 pounds pressure evenly on the clutch washer plate flange with the clutch engaged. Measure the distance between the backing plate and clutch housing at the three mounting points where the shims are to be installed using feeler gages. The proper amount of shims to install at each spider, when the unit is assembled, ist the average dimension minus .050 inch.

For adjustments installed, each shim pack is a laminated set .007 shims that add up to .126, plus three loose .007 shims. For clutch replacement use 1 laminated pack plus three loose shims. Adjust shim pack to get 35-45 lbs handle pull. Lobed end of shim packs point out.

Hope this helps.

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Scott Green

01-27-2004 02:15:10

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Re: Shim Packs in reply to Scott Green, 01-26-2004 06:10:07

Thank You , I'll see if they are the same in PTO as Power booster. Would you happen toknow if they are still available?

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Wrenchbender

01-26-2004 06:58:30

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Re: Shim Packs in reply to Scott Green, 01-26-2004 06:10:07

Scott, I'm not that expeienced on the power booster but it is the same type of setup the PTO has. The shims are used for wear of the clutch disks and adjusting the "snap" over center both. As the disks wear you remove shims to maintain the over-center pressure. The "snap" pressure is the clamping force on the disks needed to keep them from slipping. If it takes too much force to snap in, then I'd say you need more shims. Someone before you may have removed shims to adjust and now they are gone. Hope this helps, WB.

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ajax implement

01-26-2004 07:05:38

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Re: Re: Shim Packs in reply to Wrenchbender, 01-26-2004 06:58:30

Scott:
For now measure the shim packs in the PTO. If they are close, remove them, install them in the Power Booster clutch and see what happens. The only adjustment I remember is a on the clevis and that is for adjusting the handle that engages the over center clutch

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