Roosa Master DBG pump fixture

harleyboy1 · Mar 23, 2018

I'm looking to reseal my Roosa Master DBG pump off my 530 Case. At this point I'm been gathering tools, a reseal parts kit and information from you guys. My question is will I need some type of a fixture to hold the pump. I hate to just squeeze it down in my vice.

JD Seller · Mar 23, 2018

Well I guess you can make a fixture if that turns your wheels. I have used a vise with a shop towel between the jaws and the case for 40 years. So I guess I am out of "date". LOL

The biggest thing you need is a straight spline Bristol wrench to remove the advance bolt/ball from the timing advance ring. They have sub a torque wrench with the outer splines ground off to fit the bolt. IF the bolt is really tight you can explode the bolt/ball and then your screwed. What helps is to take a pin punch that fits down into the bottom of the spline and give it a good whack with a hammer. This will help knock the bolt/ball lose so the modified wrench works mot of the time.

harleyboy1 · Mar 23, 2018

Very good to know...All help needed...Thanks...

jm. · Mar 23, 2018

Lets just say this , if you have never done one your chances for success is about 50% at best maybe less. I have seen a lot of folks try it and most fail.

Bob · Mar 23, 2018

You need a manual for general instructions and torque values.

You can probably find a factory Stanadyne manual free on-line, or IH Blue Ribbon or DEERE injection manuals covering these pumps are on ebay most of the time (from what I see they are the most common and easy to find).

Scott 730 · Mar 23, 2018

When removing the advance bolt, the instructions are to give the wrench a slap, to loosen the bolt quickly. Do not apply gradual, even pressure to crack it loose.

Bob · Mar 23, 2018

Also helps to have the Stanadyne tool, basically a hardened "sleeve" that surrounds the ball head screw to hold it it position and help keep it from expanding and breaking.

harleyboy1 · Mar 23, 2018

Yes, I purchased a #21178 Cam Bushing sleeve. Do you need to cut down the diameter of a standard t-45 bit?

Dieseltech · Mar 23, 2018

Also need to know, hit it too hard, cam ring WILL crack..

JDEM · Mar 23, 2018

When I was a "field" mechanic for several Deere dealerships - I did many on the tailgate of a truck. All I used was a common bench-vise and did fine.

I just about never used the Stanadyne bushing. Most important thing to do is give the head-screw a good smack before you try to take it out.

I would never use a Torx bit unless I had no choice. Common Torx has rounded teeth edges unlike the proper 6 tooth Bristol bit like many of the older pumps use.

Roosa Master DBG pump fixture

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