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  Viewing User Profile for: OldMachinist
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Joined: 24 May 2006 11:27 AM
Last Login: 19 Apr 2014 05:50 AM
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Signature: Bobcat 453F ,Loegering steel tracks, Grouser steel tracks, 48" Dirt bucket, 48" toothed bucket, grapple bucket, 72" hydraulic vee snow plow and utility forks, 1954 Ford 860, 1952 Allis Chalmers CA, 1947 Case SC, Nashville IL USA
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 Post Statistics
OldMachinist has contributed to 2,262 out of 71,897 total posts (3.15% of total).
Most Recent Posts:
Re: Bobcat Clark 720 - My new (old) toy broke - No Movement? 2/3/2014 2:03:32 PM   (Total replies: 1)

U-joints in the coupling between the engine and pumps broke would be my guess. Don't run the engine any more till you're sure that's not the problem. It can do some serious damage if pieces of the u-joints or coupling start flying about.


Re: Bobcat Clark 720 - My new (old) toy broke - No Movement? 2/3/2014 3:29:15 PM   (Total replies: 1)

Engine needs to come out to service the coupling.

 photo EngineRemoval_zpsfcb58bd4.jpg

Re: Bobcat Clark 720 - My new (old) toy broke - No Movement? 2/4/2014 5:58:07 AM   (Total replies: 2)
The coupling is bolted to the engine flywheel and just slides on the splined pump shaft so if it's flopping around something is broken.

Re: Bobcat Clark 720 - My new (old) toy broke - No Movement? 2/4/2014 9:03:34 AM   (Total replies: 1)
While you have the engine out remove all the tin shrouds and clean the cooling fins. After it sat so long I'd expect there to be all kinds of critter nests in there. The Wisconsin engine doesn't like running overheated they tend to vapor lock easy also it can warp heads and blow head gaskets.

Re: Bobcat 643 - front right wheel fails to drive 4/7/2014 7:42:55 AM   (Total replies: 1)
I emailed Tazza and asked him to look at this thread to see if he can help.

Re: 543 with slow lift/bucket action 10/25/2013 6:14:16 AM   (Total replies: 1)

To check the pressure at the auxiliaries you can use a quick connect fitting or remove one of the quick connects to put a minimum 2000 psi gauge.

There were several different control valves depending on serial number.

The pump also depends on what serial number you have.


Re: 543 with slow lift/bucket action 10/23/2013 9:30:38 PM   (Total replies: 1)

The only for sure way to test the pump is to do a pressure and flow test but most people don't have access to the tester to do that so your next best thing is to check the hydraulic system pressure at the aux. connectors and see if adjusting the main relief valve helps. The 543 pressure should around 1500 psi at full throttle. The relief valve is adjusted by adding shims inside it to raise the pressure. Each .010” shim increases the pressure 100 psi.


Re: 543 with slow lift/bucket action 1/4/2014 2:20:06 PM   (Total replies: 1)

It depends on your serial number. Early units had a male fitting made on the reservoir and later ones had a female fitting with a male nipple screwed in it. Both then just have a hydraulic hose screwed on.

Re: Bobcat Fuel Shut off Solenoid 4/14/2014 4:17:18 PM   (Total replies: 0)

The wiring diagram for the early 864 has wire colors. For the later machines the wire numbers are printed on the wires and at the top of the diagrams there's a guide to the colors based on the numbers like this.

 photo 864_wire_colors_zps26d75c09.jpg

Re: NEW HOLLAND L553 4/15/2014 6:51:00 AM   (Total replies: 1)


 photo capslock_zps8e6d4caa.jpg


All caps is considered yelling.




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