Bosch injector pump replacement head/drive

Recently picked up a pretty straight 88 diesel with hydraulics and 3 point, had sat for years and the previous owner tried to pull start it, shaft twisted off in the injection pump, does anyone make replacement shaft? who might be a reputable rebuilder. no one around here wants to touch it. I have a plain jane gas 88 that I might just do an engine swap, probably a cheaper route to go.

I'd check with Dieseltech on here. Very knowledgeable and resourceful. Hopefully he'll be along shortly.

No one wants to touch it because rebuilt hydraulic heads are not available anymore. Years ago I could get about any part needed for the PSB pumps, now I hate to see them come in the door. I have two Case PSB pumps with severely worn heads, not broken but won't pass the low speed crank delivery needed to start the engine. If you can find a RUNNING 77, 88,or 99 they all used the same hydraulic head, just calibrated different. If a pump is sent to me that's set awhile, WITHOUT TURNING THE ENGINE I can sometimes save them, but pump MUST be removed as is, where is WITHOUT SETTING THE TIMING!! If pump has a stuck plunger as most do, just turning engine by hand WILL wreck the pump..

Diesel, I have a Super 88 that's been sitting a while. Is there an easy way to check the plunger?

Only with trained hands that KNOW how that pump feels and works. Any guessing usually means it's ruined. The so called screw driver test doesn't mean much either, that just checks the metering sleeve. The hydraulic head plunger might STILL be stuck, then broken soon as the pump is turned even though the metering sleeve is not stuck..

I have found them on ebay occasionally. $350 and up for one off a "running tractor". I have found parts ones for much cheaper and got the head freed up but have never had them tested. You can switch them to a roosa but you would need to find a donor engine to get the front cover and such off. I dont know if side covers would fit.

Dieseltech

A general question - about how often do you need to turn these over to keep them free?

I have a Massey Harris 33 diesel, I start it every two months and let it run awhile. I also add some two cycle oil to the fuel to help with extra lubrication. I'd be afraid of trying to start any PSB pump that's not run a year or more, have seen too many come in with broken plungers...

I try to start mine about once a month. 6 months at the most any longer than that I check them. Doesn't take long after you do it a few times. I put atf and some diesel additive. Two stroke oil is a good idea too.

I try to start mine about once a month. 6 months at the most any longer than that I check them. Doesn't take long after you do it a few times. I put atf and some diesel additive. Two stroke oil is a good idea too.

Thanks.

We have one on an intermittent use AC 45 grader. It leaks some to the sump so we turn the fuel taps off when standing. Would this make any difference?

If it has a gear pump, seal PK7910 may be leaking. Can also be the lower head seal and/or the heavy O ring on the oil filter bolt if there is one, late pumps don't use it.

Thanks for that. Some more on the saga. An "only in Australia" - a son had a kangaroo put his motorbike into a fence and nearly cut his throat on the barb wire. So we decided that a grader was needed - but it had to come from the ground up, not the shiny side down. A friend had an AC Forty Five that had run a big end (rod) bearing so we started there. Another friend found a never used short motor in a clearing sale, which came with a "reconditioned" pump. We got it running on a stand with a temporary fuel tank - the rest of the contents of which were in the sump next day. Which is where I started to learn what the insides of a PSB pump looked like.

Turned out that the lower head O-ring was missing - so that is new.

We borrowed a neighbour's injector tester and got 6 good ones from our selection. The primary pump is "as supplied" so I assume it has a new seal in it. I did put a new one in the one on the spare injector pump but haven't braved changing them over as yet.

That oil supply O-ring is the square one that is NLA I'm presuming? Can you use an round one?

We got it in the grader and found it would start with throttle but then stall if brought back to idle and throttled back up. That son was doing a Cat apprenticeship at the time and very patient. It took him most of a day to find a small burr on the shaft that runs the metering sleeve that locked up with primary pressure.

As first assembled we needed a sniff of ether to get it started hot or cold. Son did some "tuning by ear" and it now usually needs ether only for a cold start.

Usage is mainly roads and fencelines on a 20,000 acre ranch, so not many hours a year. Latest project has been an airstrip. I was waiting till our dozer came home to clear the trees and logs. The older two boys were home for holidays (both work in the big cattle ranch areas of northern Australia, both pilots) and did it all with the grader. So it has about earned its keep for this year.