Ever fully closed a grapple in a D?

radman1 · May 31, 2007

Hopefully, another bobcat dealer/salesman will help answer this issue. I just can't believe they designed it that way. For example, if the toolcat was using a hydraulic PHD and the bit stopped/hit a rock, it would potentially cause a burst in the hydraulic system? Major design flaw if that was true. This doesn't happen with any skid steer on the market, including Bobcat. On my bobcat 873, I am frequently running the axillary hydraulics against stopped/nonmoveable loads on the attachments including trencher, tree spade, tree shear, 2 different grapples, PHD etc. Hydraulics do not burst or even threat of problem.
The distribution block mentioned earlier is present on most newer bobcat skid steers and are designed for 3000 psi. I believe there must be a problem on the relief valve of that toolcat or faulty distribution block. Standard flow or high flow setting should make no difference.

radman1 · May 31, 2007

I just talked to my salesman/dealer. He said holding the auxillary hydraulics on is not an issue for the hydraulic system. Nothing should break/burst.
He has sold 2 D series units, no problems. Has had 3 more stock units on order for over 3 months but not yet arrived. Says they only units he can get at this time, are units that are already sold. Can't get units yet for stock. Sold units are given priority in the build process over in stock built units.

jmfox · May 31, 2007

Here's another problem related to axillary hydraulics and triggered by static pressure:

jmf

Hydraulic leak between two left wheels 743B
Posted: 01/09/2007 08:16 AM
Looks to be between pump and body, is this my auxillary pump? I have no repair manual does anyone have a parts break down of pump or bobcat? I Lent out my Bobcat to a friend and he applied lever in auxillary mode with no aux attachements and now i`m leaking fluid around pump on left side . I need help please

dakota-2000 · May 31, 2007

I've moved logs and a lot of big rocks so far with the 4-way bucket. I clamped on to rocks hard like I did with the C with no problem. The big problem I'm having with my D is the cooling fan won't come on. I thought it the overheating was a air lock in the coolant but it wasn't.

The service man came out and diagnosed my problem as a faulty hydraulic motor on the fan. He ordered a new one and in the meantime I give the fan a poke with a screw driver each time to get it started. I will use it that way until he gets the new motor.

jmfox · Jun 1, 2007

Before taking delivery of a machine (along with kicking the tires) it would be a good idea to detach all hydraulic couplings and exercise the hydraulics, especially the auxiliary, to check for leaks. On my old Ford tractor I capped off two hoses until I can find a new top link, and now I'm wondering if this could be the cause of a new leak in the control block.

jmf

White Shark · Jul 8, 2007

jmfox said:
Before taking delivery of a machine (along with kicking the tires) it would be a good idea to detach all hydraulic couplings and exercise the hydraulics, especially the auxiliary, to check for leaks. On my old Ford tractor I capped off two hoses until I can find a new top link, and now I'm wondering if this could be the cause of a new leak in the control block.

jmf

Good advice. When machines are new, they sometimes develop minor leaks too, that can be fixed with a twist or two of a wrench. I've had this happen on a CAT 304 excavator and a CAT skidsteer. No biggie. Each machine had less than 10 hours when the leaks started. I got the wrench out and they were fixed in minutes.

Having a hydraulic block die is another matter. Something is faulty or defective. Those things are designed to take punishment and plenty of high pressure. The Dealership guy needs to read the Service Bulletins or do some asking around since that is not normal...

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