JD400 Industrial injectors and rework ??

Nephew bought, stuck engine, took head off, #4 piston stuck other 3 good. Question is, should we have head redone or just throw in new injectors ? Pistons and sleeves look great but will check with
measuring devices etc to see if we can put standard bearings back in, plan on putting new rings. Would anyone know the injector part number ?
This is numbers i got off tractor engine T26933 D M53TW 088268T
this is numbers i got off frame by seat lower right side T4W3D 0611171
This tractor will just be used for brush hog and misc use.
Appreciate any input to help us out.
Thanks in advance
 
Find a good machine shop and let them check it. It could be still in specs or it might be very worn. If the valves are not within specs your tractor will start very hard. Years ago many small shops would get an engine head off a Deere and grind the valves to deep making them hard starters. Another good idea would be to have your new injecters checked as some new ones are not right. Tom
 
For the brakes, what type fluid and where does it go ? I have the service manual. I see a hydraulic resivoir by radiator? Also the plug in rear axle behind seat, what type fluid and where is fill lever plug. ?>

thanks much in advance
 
(quoted from post at 16:28:44 07/08/18) For the brakes, what type fluid and where does it go ? I have the service manual. I see a hydraulic resivoir by radiator? Also the plug in rear axle behind seat, what type fluid and where is fill lever plug. ?>

thanks much in advance

Hyd trans pump fills brake reservoir when engine is running. JD Hy-gard oil or it's equivalent. Hyd oil filler hole is behind seat on rockshaft housing. Check hyd oil with engine at idle speed with nut on dipstick resting on threads. Dipstick is located close to right heel when operator is sitting in seat
 

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