Firstly sorry I previously posted in wrong section, oops!! I have a 643 , rear chain broke and has doubled over in rear top cnr, have been trying to free it up but access is a night mare, thinking I might have to undo bolt holding rear sprocket on to get chain off, any tips for this, ie, left hand thread or right, will undoing this mean axle can come out?? Also machine does creep a bit when idleing is this just an adjustment to levers??? or worn hydraulics??
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skidsteer.ca
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Most of the sprockets are press on, they won't just come off when the bolt is removed. You need to use a porta power orjsckto pull the axel out.
Common practice is to use the drive of the loader to loosen the bolt. If you have a broken chain however this can't be done for that wheel.
Ken
Thanks for that Ken, thankfully I dont need to remove sprocket. Was wondering though is it possible to tighten wheel bearing, i seem to have a little play, about 5mm on each one,in and out ways which means when turning 180 degrees the movement becomes 10mm from side to side if that makes sense?? when doing this under load there was a clunking noise coming from chain area, not sure if it was skipping a tooth on sprocket but sounded like it. also fair amount of play in hydraulic drive motors also about 10mm is this a sign of wear??this means when doing 180dg turn chains may not line up properly between drive sprocket and wheel sprockets
clunking noise may also have come from a piece of metal floating around in there, tried to upload a pic of it for identification but havent worked that out!! It is a half circle magnetic 8mm thick, 50mm wide no idea what it is from any advise welcomed
skidsteer.ca
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The book calls for something like .005" end play in the axels and the only adjustment is new bearings (you may be able to shim them tighter, but with all the work for the play you have not sure its worth it) I'd say if your seals don't leak, forget it.
Do all your other chains look ok? No missing rollers etc. How much are they stretched?
With the tires off the ground how far can you rotate the face of the tire fore and aft before the hains becomes tight. @3" is about right
Ken
can onyone tell me where this part may have come from , found it in chain case of 643 bobcat, 8mm thick 50mm wide 70mm long, also magnetic
everything seems to be in order with all sprockets, cant see anything like it on front sprockets or drive motor, could it be part of brakes??? I dont have a manual so any comments welcomed, regards Rob
OldMachinist
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Likely is a magnet that a previous owner put in there to collect metal shavings. A lot of people do that including me. I epoxy magnets inside the pan of any engine, transmission or gear case I work on.
I agree, that looks like a magnet to pick up any metal shavings that come from chain or sprocket wear.
You can take up the slack in the axles by skimming a little bit bit from the washers that the bolts go through that hold the sprockets on. You basically make a step that will pull the axle in a little more to take up any end play. 5-10mm is quite a lot, you may be up for a set of bearings soon.