642b hydraulic valve diagram?

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Dadhasabobcat

New member
Joined
May 14, 2024
Messages
3
Newb here. Just trying to see if anyone has a GOOD break down diagram for the hydraulic control valve on a 642B. I know nothing about working on this stuff. My dad bought this skid steer a couple years ago and the hydraulics are gradually leaking more and more from the control valve area(to the point now he looses too much to justify using it). He has taken it to his cousin that is a pretty good shade tree mechanic. He needs a good diagram to take the valve control apart and rebuild it. I've looked online but haven't really found anything useful I can print off. I got a copy of the manual but nothing seems to break down the parts to know how to take apart and put back together. Neither of these guys are big on computers so I'm trying my best to find something I can print and take to them. Anyone here have one I could print? OR is this control valve the same/very similar to another model that does have a good diagram I can print? The serial number begins with 5040 I do believe but would have to verify that again.

He would also like to change the ring gear if he can find the right one but said it's not 'vital' yet. Just figured while they had things apart they'd go ahead and do that. It currently has a couple teeth missing so you just have to bump the key to get to the sweet spots to catch lol

Again, I don't really know enough about this stuff but they do so I'll take any info/advice/help straight to them. Much appreciated!

-Justin
 

ZekeSkyree

Well-known member
Joined
Nov 9, 2023
Messages
47
Justin,

Do you have the "service manual"? If not. Here it is. There is a pretty good diagram of the hose routing as well as valve rebuild instructions (chapter 2). The valve assembly rebuild is pretty straightforward, but getting it out is the trick. I pulled the motor out, which gave me the room I needed to get to it as well as being able to remove all the hoses. Make sure you label every hose and take pictures. I would also recommend a video as insurance.

Let me know what you need, as I just did this 6 months ago on my 642...

Grant...
 

Attachments

  • Bobcat 641, 642, 643 Skid Steer Loader Service Manual.pdf
    15.9 MB · Views: 55
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Dadhasabobcat

New member
Joined
May 14, 2024
Messages
3
I think I only found the operator's manual for him. That looks MUCH better! I'm sure my dad's uncle can follow along with that. And yes, he is going to pull the motor as well, that's why dad thought about pulling the ring gear at the same time but if he can't figure something out a little cheaper, he's just going to live with it. lol I appreciate the tips as well and will pass those along to make sure he knows where everything goes when it gets put back together. Thank you VERY MUCH! I really do appreciate it! This is awesome!
 

brdgbldr

Well-known member
Joined
Jun 1, 2012
Messages
1,283
Attached is an older control valve manual.

Hope it helps.
 

Attachments

  • Control Valves.zip
    24.5 MB · Views: 33
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