Jd 300b hard to start when hot

[Mallard1]

Have a 70痴 model John Deere 300b backhoe that on the first crank of the day will bust right off easily. However after warmed up the starter has a tough time spinning the motor. The battery is a few years old but even with jumper cables it wont crank. The only way I can get it to crank is to have the stabilizer lever pushed to lower while also using the key. I guess this is taking the pressure off the hydraulic pump. I also have the boom on the ground and the front end loader in float. With the clutch fully depressed.

Is this a bad accumulator? Bad injector pump?

Once cranked it runs fine for a machine with 4100 hours. Thanks for the help.

 

[Zebrafive]

What you are doing does take off some of the hydraulic pump load off. Another trick is turn the steering wheel side to side.

I am not sure where the ground cable connects on your 300b. but on my JD 2030, it connected to the sheet metal of the battery box. I ran a longer cable to the engine block (one of the bolts for the fuel filter mount).

What really helped was a gear reduction starter.

 

[Tx Jim]

If none of above helps you might consider installing this electric operated hyd destroking valve. RE32529 VALVE, SOLENOID DESTROKE ADD 241.57 USD

 

[Mallard1]

If none of above helps you might consider installing this electric operated hyd destroking valve. RE32529 VALVE, SOLENOID DESTROKE ADD 241.57 USD

Thank you for this. I looked at the diagram and it looks like it just needs one side grounded and the other to the start wire from the key switch. Which port on the hydraulic pump does it screw into? Thank you for your help

 

[Tx Jim]

What is your tractor's serial #? Does hyd pump have a serial # plate?

 

[Mallard1]

What is your tractor's serial #? Does hyd pump have a serial # plate?

Tractor serial number is 300BD 281699T
Back hoe serial number is 9250 A 038713T

I saw the pump serial number plate this weekend, I will grab a picture of it Friday. Thank you for your help.

 

[number two]

Perhaps you have a heat-soaked starter?

Good Luck!

 

[Jerry/MT]

Failure to start when hot could very well be a worn injector pump.

 

[Mallard1]

Well I went down Friday with the intention of taking a picture of the pump serial number but I forgot. I moved some trail cameras around. Knocked out the last 3 pins and got them to take grease, now everything will take grease on the backhoe. When I pulled up back at home I remembered why I went down there. I値l try to do a better job remembering this weekend

 

[Mallard1]

I made it down today here are the pictures