642b Ax hyd. Can it be added

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brettk1

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Hi new owner here. Can aux hyd. be added to a 642b and if so any suggestions on the best way???
 

Tazza

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Are you sure its not already there just not enabled?
Do you have 2 quick couplers on the left side hanging off the boom?
If you do, you should just need to enable them, this is done by removing a bolt and nut on the right hand steering lever. This will allow the lever to move left to right controlling thy aux hydraulics.
If you don't have the couplers. you will need to run 2 hoses or tube lines up the arm, down the back and into your control block. I see no reason why it was not setup from the factory though. Look to see if its as simple as the lock out bolt being still there.
 

skidsteer.ca

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Are you sure its not already there just not enabled?
Do you have 2 quick couplers on the left side hanging off the boom?
If you do, you should just need to enable them, this is done by removing a bolt and nut on the right hand steering lever. This will allow the lever to move left to right controlling thy aux hydraulics.
If you don't have the couplers. you will need to run 2 hoses or tube lines up the arm, down the back and into your control block. I see no reason why it was not setup from the factory though. Look to see if its as simple as the lock out bolt being still there.
Look at the hyd control valve that the foot pedals connect to. There is one section for each foot pedal and hopefully a 3rd section conected to the RH steering lever.
If that section is not there it can be added to the valve and lines with couplers would have to run out to the end of the boom. No idea on the cost, but the sectionmay be available from the manufacturer of the valve. It will be available from Bobcat, though you may want to check a few dealers for the cost of the kit. If it seams expensive you could also go to a place like www.surpluscenter.com and buy a electric valve and plumb it in.
Hopefully Tazza is right and you just need to unlock the lever.
Does anyone know what year aux hyd became standard equipment?
Ken
 

Tazza

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Look at the hyd control valve that the foot pedals connect to. There is one section for each foot pedal and hopefully a 3rd section conected to the RH steering lever.
If that section is not there it can be added to the valve and lines with couplers would have to run out to the end of the boom. No idea on the cost, but the sectionmay be available from the manufacturer of the valve. It will be available from Bobcat, though you may want to check a few dealers for the cost of the kit. If it seams expensive you could also go to a place like www.surpluscenter.com and buy a electric valve and plumb it in.
Hopefully Tazza is right and you just need to unlock the lever.
Does anyone know what year aux hyd became standard equipment?
Ken
Well my 731 was a 1978 model, it had aux hydraulics as standard. It may be different for other countries though.....
 
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brettk1

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Well my 731 was a 1978 model, it had aux hydraulics as standard. It may be different for other countries though.....
Thanks for the help. Well Tazza there are no hoses or tubes on the boom for aux.(there are unused mounts). The right control does not seem to have any bolt or pin that the removal of would allow it to twist right and left. Skidsteer mentioned the Hydraulic control valve, now here it gets interesting. I located the mechanism from foot petal to control valve, each foot pedal moves a (spool???) in and out of the control valve body. A Third (spool??) appears to be unused with no linkage attached?? Any suggestions on how to use third valve. Or more details on electronic switch (ie where to located it in system and how to plumb etc.
 

sterlclan

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Thanks for the help. Well Tazza there are no hoses or tubes on the boom for aux.(there are unused mounts). The right control does not seem to have any bolt or pin that the removal of would allow it to twist right and left. Skidsteer mentioned the Hydraulic control valve, now here it gets interesting. I located the mechanism from foot petal to control valve, each foot pedal moves a (spool???) in and out of the control valve body. A Third (spool??) appears to be unused with no linkage attached?? Any suggestions on how to use third valve. Or more details on electronic switch (ie where to located it in system and how to plumb etc.
the third spool should be aux it hooks to the right hand lever with a rod and swivels does the right lever have a bolt running through the base ?the bottom of the lever should look kinda like two c's one inside the other and may be bolted together remove the bolt and the lever will move side to side. the linkage hooks to the inside c and the lines will hook directly to the third spool do you have a service manual?if not you should consider getting one. good luck and welcome to the forum..........Jeff
 

skidsteer.ca

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the third spool should be aux it hooks to the right hand lever with a rod and swivels does the right lever have a bolt running through the base ?the bottom of the lever should look kinda like two c's one inside the other and may be bolted together remove the bolt and the lever will move side to side. the linkage hooks to the inside c and the lines will hook directly to the third spool do you have a service manual?if not you should consider getting one. good luck and welcome to the forum..........Jeff
You have the most important and hard to install part, the 3rd valve section.
You need to unlock the rh steering lever and connect the spool to it with a linkage.
Then it is just a matter of plumbing the 2 lines up the boom and installing the quick couplers.
The steel tube lines were around $30 each for my 553. You will need to get some hoses made locally. Perhaps talk to a local dealer or two and see if the price for the parts to finish the install is within reason. Or see which parts you really need to purchase oem. Perhaps they would even have used.
I manual would also be a great tool to have put may not cover the details of the install.
Ken
 
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brettk1

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the third spool should be aux it hooks to the right hand lever with a rod and swivels does the right lever have a bolt running through the base ?the bottom of the lever should look kinda like two c's one inside the other and may be bolted together remove the bolt and the lever will move side to side. the linkage hooks to the inside c and the lines will hook directly to the third spool do you have a service manual?if not you should consider getting one. good luck and welcome to the forum..........Jeff
Thank You I'm beginning to get a picture of what I need to do I'll look again at the right control assembly . Yes I do have a service manual , however Sterican your paragraph (and info from others), put the manual to shame. Thanks all.
 
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brettk1

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Thank You I'm beginning to get a picture of what I need to do I'll look again at the right control assembly . Yes I do have a service manual , however Sterican your paragraph (and info from others), put the manual to shame. Thanks all.
Ok I took a close look at the design of the right hand control. The control arm is welded to a square plate which in turn is bolted with four bolts to tranverse piece of round stock. There appears to be no way the right control is going to pivot . Any other good ways to activate my unused third spool????
 

skidsteer.ca

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Ok I took a close look at the design of the right hand control. The control arm is welded to a square plate which in turn is bolted with four bolts to tranverse piece of round stock. There appears to be no way the right control is going to pivot . Any other good ways to activate my unused third spool????
Some other brands of loaders us another foot pedal in the middle, but that would be a paint for some jobs to. I think best bet would be to have someone email you a few pics of how bobcat does it. Your must have been modified or had the steering lever changed at some point imo. It is really fairly simple once you see it.
In the mean time you can hunt for the boom lines, decide on weather you want the new flat couplers (good idea if you want to rent of borrow attachments) or the Pioneer style that was used up until @ 1996 or so.
Are there 2 caps blocking the ports on the 3rd spool now or do they have some lines coming from them? Going to ??
Ken
 
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brettk1

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Some other brands of loaders us another foot pedal in the middle, but that would be a paint for some jobs to. I think best bet would be to have someone email you a few pics of how bobcat does it. Your must have been modified or had the steering lever changed at some point imo. It is really fairly simple once you see it.
In the mean time you can hunt for the boom lines, decide on weather you want the new flat couplers (good idea if you want to rent of borrow attachments) or the Pioneer style that was used up until @ 1996 or so.
Are there 2 caps blocking the ports on the 3rd spool now or do they have some lines coming from them? Going to ??
Ken
There are lines coming from the third spool.. Why.
 

Tazza

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There are lines coming from the third spool.. Why.
UUM, from memory the spool you want is actually the 4th..... On my 743 i have 4 spools, but my 731 had only 3.
If i get a chance (and remember) i will take a few piccies of mine to show just where you need to plumb into. The lines you said you have, are they plugged off on the left side looking in from the back? This is probably your lines for rear stabilizers and not aux hydraulics. There is no reason why you can't use it though, its controled by the left lever and not the right one. Its attached with a cable from the lever to the spool. Its an option if you can't do it with your right lever.
Basically the spool you want will have a large cap on the end that is visable from the rear of the machine, it will have an E clip on the end. You should have 2 of these, one is for your lift section and the other is for your axu hydraulics. Inside here is a set of steel balls and spring used to lock hydraulic flow for use of snow blowers/excivators etc, anything that requires constant oil flow.
I hope i haven't made things more confusing for you....
 

jerry

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May 3, 2007
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UUM, from memory the spool you want is actually the 4th..... On my 743 i have 4 spools, but my 731 had only 3.
If i get a chance (and remember) i will take a few piccies of mine to show just where you need to plumb into. The lines you said you have, are they plugged off on the left side looking in from the back? This is probably your lines for rear stabilizers and not aux hydraulics. There is no reason why you can't use it though, its controled by the left lever and not the right one. Its attached with a cable from the lever to the spool. Its an option if you can't do it with your right lever.
Basically the spool you want will have a large cap on the end that is visable from the rear of the machine, it will have an E clip on the end. You should have 2 of these, one is for your lift section and the other is for your axu hydraulics. Inside here is a set of steel balls and spring used to lock hydraulic flow for use of snow blowers/excivators etc, anything that requires constant oil flow.
I hope i haven't made things more confusing for you....
Brett, in the photo gallery here there is a picture of a 643 from MJb it is #4 of 7 and it shows the right hand control lever with the aux rod attached. Does yours look like that? If it would help I could take a picture of our 632 which is quite similar but the rops does not tilt so I would wait till the weather got a little warmer, if it is needed I will do it. Jerry
 

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