pump for 856 mcv

[jpc199]

i was wondering if I can put a 12 gpm mcv pump in my 856 instead of the 9 gpm and if it will just bolt right on or not thanks for any help

 

[caterpillar guy]

The rear pump for the hitch and scv's will not work for the front pump on the MCV if that is what you are asking. Why the need for more volume there anyway? Our tractors have been fine with the 9GPM pump. Would have been good if they would have put about a 20 GPM pump in the rear with about 2500PSI on it.

 

[jpc199]

I was wondering if the pump for the 86 series would fit maybe its a 13 gpm its had a lot of problems with poor steering and the ta not engaging half the time. when it does engage it works without slipping I can hold the brakes down and stall the tractor but other times it will only move an inch and stop it works the same with the ta ahead or back. I'm going to put in a new pump and rebuild the mcv and was just wondering abt going with the 13 gpm 86 series pump thanks

 

[BarnyardEngineering]

Volume is not your issue. If it won't work with the 9GPM pump in good shape it won't work any better with 13GPM.

 

[the tractor vet]

Nine gallon is more then enough pump . Now you may and probably do have other problems . You may have a blowen o/ring or gskt in the MCV it's self , You may have a problem in the T/A causing and internal leak or you may have the adjustment out of wack like the spool valve not going all the way down to the snap ring or not going all the way up. Improper dump valve adjustment . Also the valve springs or sticking valves in the MCV . Before i start throwing money at a problem i want to knw what the problem is first , A pressure check with the special test valve and two gauges is my first test , then the next is running a FLOW RATE on the pump with my flow rater . Does you T/A dump valve lite come on like when you make a turn and step on the brakes , does it up shift and down shift on it's own ?? Does you teltail light even work ??
Is your Hyd filter bee changed along with ALL the oil , are you usen the correct oil .

 

[jpc199]

thanks I appreciate thehelp