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Trouble shooting:

Starts hard:

Verify air cleaner is clean, just because they look clean doesn't mean they flow the correct amount of air, replace it if in doubt. Blowing out air filters does not work the element usually get more packed with debris then what you get out.

Verify cranking speed is sufficient, If cranking speed is not achieved then injection pump will not supply adequate fuel to start.

Start by cleaning and charging battery/s, if battery is good check starter voltage drop, if good replace starter, we can supply most machines

with a OSGR (Offset Gear Reduction Starter) to increase cranking speed and less battery draw.

Verify fuel is fresh and supply is good, check lift pump if it has one and check for fuel suction leaks. Install clear fuel line from fuel filter to inlet on injection

pump and monitor for air bubbles, if bubbles are present you have a suction or vacuum leak in supply hose, keep moving clear hose closer to tank

until problem area is found and no air bubbles are present.

Verify and or change fuel filters, do not assume because you just put a new filter on recently it is good, if you have fuel contamination issues the filter will

be plugged up and need to be replaced and the tank should be cleaned or replaced as well as all the supply lines. Supply issues can be found with above test procedure.

Remove top cover on injection pump and look for debris / rust if you see chunks laying in the pump the governor flex ring has failed and probably plugged the return fitting in top cover and return lines, you can remove the fitting and clean it to get machine to run enough to get repairs made,  there is a little plastic ball and spring inside be careful not to damage or lose these. Do not continue to operate the unit as there is no control over the governor weight cage and the cage and pins will bang against each other causing more metal flakes to be sent through the pump, remove pump and send it in for rebuilding.

If all of the above checks out, verify that your compression is good. Good compression range will very between engines but typically you want to see

400lbs of compression and above for a good running diesel engine. See manual for your engine for suggested rebuild tolerances


Starts Hard Hot:

See above (Starts Hard) if all verify then injection pump pumping head may be weak when fuel is hot it gets thin, when this happens worn pumping head leak off pressure easier and do not supply the injector the full amount of pressure until engine RPM is sufficient for the pumping head to have enough RPM to make the pressure the injectors require and then it will run.

Injectors rebuilt and now starts hard:

Same issue as (Starts Hard Hot) Pumping head in tractor may be getting weak and not able to supply enough injection pressure to fire re set or rebuilt injectors.

Low Power:

Verify fuel is fresh and supply is good, check lift pump if it has one and check for fuel suction leaks. Install clear fuel line from fuel filter to inlet on injection

pump and monitor for air bubbles, if bubbles are present you have a suction or vacuum leak in supply hose, keep moving clear hose closer to tank

until problem area is found and no air bubbles are present.

Verify and or change fuel filters, do not assume because you just put a new filter on recently it is good, if you have fuel contamination issues the filter will

be plugged up and need to be replaced and the tank should be cleaned or replaced as well as all the supply lines. Supply issues can be found with above test procedure.

If all of the above checks out, verify that your compression is good. Good compression range will very between engines but typically you want to see

400lbs of compression and above for a good running diesel engine. See manual for your engine for suggested rebuild tolerances

White smoke:

Smoke that is white and burns your eyes is usually signs of fuel supply and or early injection timing, restricted air flow and or low compression, verify air filter is new. Try advancing the pump on high hour machines, if problem doesn't change then verify supply and fuel quality, if good test compression if good injection pump head is weak.


Black Smoke:
Air filter is plugged, Exhaust is plugged, Turbo is not sufficient for amount of fuel and or fuel pump fuel setting is set to high for engine.

Proper set pump and turbo size will have little to no black smoke under full load.

No fuel to injectors:

Check fuel shut off solenoid for voltage and make sure voltages is not dropping off while cranking/running.

Remove cover and verify SOS is moving with power, if not moving replace solenoid.

If no fuel SOS pull cover and verify metering valve under spindle governor bolt moves freely and no debri / rust in pump if no issues found verify supply to pump

If supply to pump is good, check transfer pump screen where fuel inlet is to make sure its clean, if no issue are found pump needs to be rebuilt.

Broken pump shaft:

Seized pumping head from poor fuel or pump is turned up to much for line and injector size.