D3G won't always go

[willd8r]

Hi There's one D3G in our bunch of four which keeps running out of drive seems like running out of oil but has plenty, pumps good etc wonder if is the ECU only happens intermittently,never when the mechanic is around any thoughts.

 

[JBSSU]

What is serial #?... Is it a hydrostatic machine?

 

[willd8r]

It is hydrostatic I will have to check serial no next week it's reasonably late model done about 8000 hrs

 

[wormkiller]

Could be the load sensing valve sticking and not letting pump fully stroke.:usa

 

[gerald]

Sounds crazy, but we had a 3G do that. We tried several things that didn't work. We put a new battery on it and no problems since. Gerald.

 

[JBSSU]

When you say it runs out of drive..What does that mean?..Does it stop & will not move or does it seem like it is low on drive power?..some d3g had problems with sticking decelerator cables, not allowing the engine to reach high idle speed. Check to see if when the machine acts up, you're not reaching high idle. High idle speed should be 2400rpm t/-40 rpm. Once the engine speed starts coming down the ECM starts to destroke the hydrostatic pump because it thinks the engine is being lugged. There was also problems with sticking spools in hydrostatic motors... but that normally caused only one track to die out, never seen both sides stick at the same time, but i suppose that could happen.

 

[willd8r]

It's ok for first half hr so I guess when at operating temp the prob starts motor runsfull revs power seems good, both sides stop.It just stops then seems to go a meter or to then stops again and carry's on like that may come right for a few pushes and repeats.It never comes right until completely cools down then you might get half an Hr.It makes no difference if pushing or driving from A to B. We had a prob with one of the others one battery died but the brakes can on due to low voltage, new batteries then good

 

[willd8r]

Replaced battery seems ok now thanks for advice