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it indicates that there is a fuel shortage problem
check the supply pump for fuel supply to the pump elements
if the fuel supply pump is part of the injector pump , there could be a blockage in the fuel line or air still in the system
of there is a good supply of fuel to the pump then contact the shop that reconditioned the pump
if you just fitted another pump without reconditioning it , then talk to an accredited diesel pump specialist shop
you will need a separate hose from the pump through a valve to the slasher motor. Talk with an accredited hydraulic shop and they will explain how it can be done
Talk to david brown parts department and quote the tractor serial number and the engine serial number and they should be able to tell you the part number for the crank that will fit that engine. . They should also be able to tell you the year and model of the engine so with the part number and the other details you should be able to source from a tractor wrecker the shaft you need.
On the right hand side of the axle on top is a cover with 2 slotted bolts holding it on. Pull this and you will see additional linkage, and a heavy cable which conrols the rockshaft. There should also be 2 valves under this cover. Pull the valves out, inspect for damage, clean them up real good and reinstall. If it continues to leak off at the rockshaft with hand pressure, Then readjust the linkages. NOTE: There are 7 adjustments to the linkage to get this to operate properly, each adjustment affects the sensitivity of the rockshaft and need to be done in sequence. Yours is a David Brown 990 tractor. Your Case dealership will have the manuals for the adjustment procedure. If after adjustment, it continues to leak off, you will need to pull the rockshaft cylinder inside the axle and have it rebuilt.
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