D8H hasn’t ran in 15 years and I can’t get it to prime up. Replaced all 6 injection pumps and changed filters. It ran on its own power once while forcing fuel with air and loosening lines to injectors. Now I can’t get it to pick up fuel again. While forcing fuel with air it has little to no return fuel. Please help!
Rust in the fuel lines , blocked banjo filters .
these sorts of things , 15 years is plenty of time for rust to build up .
Update,I hooked an electric pump to the transfer pump and was able to get it started after 5 minutes of turning it over and bleeding the lines. It ran until the battery died but it seemed weak. What are the possibilities of the transfer pump not doing it’s job?
check your lines for blockage pull the line off where it goes in to the transfer pump from the fuel tank and see if you have a good flow it should flow pretty fast did you have fuel pressure when it was running there is a gauge on the dash unless it is broken
Screen in fuel tank? Did you supply fuel to electric pump from a source separate from the fuel tank line?
It has good flow to the pump. I thought the transfer pump might be bad but it doesn’t look like there is a lot that can be wrong besides the gears wearing. They look good though. I didn’t realize it has a fuel pressure guage until after I removed the transfer pump
Where is the screen?
I did use a separate fuel source.
Take a close look at the fittings on the outlet underneath the tank. There is often a check valve installed somewhere around the shutoff valve that can get clogged with debris. In fact even the valve itself can get plugged up.
I think Nige could find a picture or parts break down to show that. The screen location, If memory is right, just unscrew the valve at the bottom of the tank, remove it from the tank and its there. Too many years gone by since fooling with that.
Do you mean you have replaced the injectors or the plungers on top of the injector pump ? Forcing fuel with air is not a good idea , it will force rust or sediment into the system . If you are using an alternative fuel supply don't worry about the tank just yet . Has the air been bled from the filters ?
Did you find and clean out the Primary fuel filter/screen? The Primary fuel filter contains a washable element that comprises dozens of thin brass perforated washers, this filter requires the element to be removed and thoroughly washed out. PRIMARY FUEL FILTER AND LINES D8H TRACK-TYPE TRACTOR | AVSpare.com spare.avspart.com
The rack was stuck from the 6 individual parts that bolt on top. Plungers I guess. This is my first experience with a D8h.
Its run twice since the plungers were replaced so we'll take it that jobs done well enough , you need to establish that the pressure to the injector pump is enough with no blockages . Keep a spanner that fits the injector lines handy in case the injector pump jams open when its running and you can't stop it . Does this tractor have a de-compression lever ? Engage that when turning over the motor to save the batteries . Whats the engine oil pressure like when it was running . It may have a rev limiter thats working for you buy not letting you run it .
Those old pumps do get a tad sticky if left for years and years. The little gear lift pumps under the end of the pump get all the water settling in them,then they rust/freeze and sheer up. They are a cheap and easy fix,but a good clean up of the rack etc are advised. They are pretty bomb proof and can be repaired by hammers and throwing stones at them until they behave.