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HELP!!!!!! J.D.- 300 D backhoe-hard/now won't start

E

Elijah w/ 300D

New User
first hydraulic filter alarm came in and would clear after running. backhoe continued to start ok. wife claims after winter and below freezing temps. Backhoe took longer to start, after cranking for some time. Now won"t start.
Changed Hydraulic filter and air filter, down a quart of oil. will add later.
All suggestions will be appreciated!!
 
We had a JD 300D backhoe when I was growing up.Only way to get that doucker to start even when hot was to screw in the destroke screw on the hydraulic pump.After you did that it would start fairly easy.
 
Cranking rpm is everything as Doug said. The de-stroker is a $15.00 part from your JD dealer.
Odds are with time, winter etc. The connections and cables have high resisitance. That drops the voltage to the starter which = slow cranking.
Use a analog volt meter and measure between the starter body and the large brass post going into the starter motor. There has to be at least 10.0V there.
2/00 cables, at least one and better two group 31 batteries. And bolt the chassis return cable direct to a starter mounting bolt or the engine block. Bolting the battery chassis return cable to sheet metal somewhere is looking for trouble.
 
Our 300 is a slow cranker too. The hyd pump was turned up just a tad, and lagged the starter. What I do to help it, is while Im trying to start it, Ill raise and lower the loader, when it raises a little it slows, but as soon as I drop the loader while cranking the engine. it will spin faster and fire up. After that its fine the rest of the day. Might work, might not. Chad
 
The 300D has an open center, stacked gear pump hydraulic system. There is no need or place for a destroking screw.
 
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