jd 350 dozer injector pump

I have a jd350 dozer with a roosa-master model c pump, number (cdc331-6dg). The book says i have to remove the water pump to remove the injector pump. but i was told i didnt have to. can someone help? the pump works fine,But the end seal is leaking some fuel in the oil, If it sits for awhile. thanks virgil

Depends on how small your hands are. You have to pull the little access cover of the timing cover on the front of the engine. Then, remove the center nut and three shear bolts that hold the injection pump onto the gear. I've done them without pulling the pump, but it's not easy.

Good luck on finding a new seal. All parts for that pump were discontinued many years ago - but maybe you can match it up with something. Some have a one-piece dual-lip seal,and one just use two, thin, single-lip seals. CDC was upgraded to the CBC, and then . . . all the Cs were discontinued and Deere sells changeover kits to install a JDB pump.

the solinoid shut off went bad and someone removed the plunger and spring. and have been running the dozer this way for awhile. i checked on a new one its around 130.00 plus tax could this be whats causing the fuel in oil? and will it hurt anything if i dont repace it? thanks

The shaft seals are putting the fuel in th oil,if your carful you can pull the pump off the shaft and change the seals then work the pump back on the shaft, be carful not to let the first seal turn inside out..

so if i take the nuts off the studs that hold the pump to the engine,that you can see looking at the pump,and slid the pump off the shaft, i can replace the seals? thanks

No you can't. NOT on a C model pump. What you describe only works on a DB or JDB model pump.

First of all, what Tim told you is absolutely wrong. You do NOT have a DB of JDB pump with a separate shaft with umbrellas seals.

As to that fuel shutoff - no -it has nothing to do with fuel in the oil. Those shut-offs were a common problem. Often, the little shut-off plunger would stick. So, it got yanked out and thrown in the garbage along with the spring. Then, the machine ran fine, but you could not shut it off - you had to stall it some way - or turn the fuel off at the tank.

Those shut-off solenoids have not been availble new for many years. If you found one for sale, it is either new-old-stock, or it's used. I've given many away to people on these forums, but I don't think I have any left. I worked in a Deere pump shop for many years. Some pump shops now are repairing these pumps with all used parts, but most won't touch them. If you don't have used parts to use, there's not much you can do.

That pump comes off the tractor with the shaft still in it. It uses a conventional, self-contained oil seal, not a set of umbrella seals like the DB or JDB pumps use. To replace that seal - you do NOT remove the shaft. You simply remove the front cover from the pump. That cover has the seal pressed into it. Change the seal and put the cover back on. Then, reinstall that pump onto the engine.

If you had to spend any real money on repairs, you'd be way ahead to use the Deere changeover parts and install the JDB pump. All parts are availble for that and it is still made new.

Where would be the best place to buy the JDB pump and change over kit? And about how much should one cost? Thanks

Jdemaris is right that is a model c pump can't slide pump off shaft.I have 300 backhoe loader it was leaking I took to pump shop where I have always used and he had new seals for it.I am still running tractor