If the tractor has not run for awhile it only takes one stuck plunger to prevent rack free movement. Remove the round cap with flats at front of pump, screw in a metric bolt in end of rack and see if you can push it in and out by hand. If not remove the side cover and loosten All injector line nuts to keep engine from starting. Now check that each plunger goes down when tappet is down as engine is cranked over. Carefully tap any lower spring seat that stick up with the tappet down. The rack MUST move freely before retightening the line nuts and starting engine. This pump needs oil added also as it is not engine oiled. Just hope it's not full of rust, causing other damage.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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