Digger hydraulics slow

[Gulli]

5.5 tonne hitachi digger.
Looking for a bit of help...
Lift and dipper arm crowd have gone really slow, and will then jerk and start moving properly. Everything else is working fine and seems to still have plenty of power although I didn't have anywhere to test it very well.

 

[Lincs Lass]

is the breaker pedal fully of or the main boom ofset pedal not creaping

 

[Gulli]

Nope no creep on the boom offset. Don't have a breaker

 

[Lincs Lass]

Could be then the main valve block or worst case ,the center block under the cab ,,pray its not that

 

[bazza3034]

When did you change the hydraulic oil last some times it loses its consistency and filters

 

[ollandroverman]

More likely pilot controls.

 

[bazza3034]

Well worth a try no harm changing the filters

 

[Gulli]

When did you change the hydraulic oil last some times it loses its consistency and filters

Would that not affect everything though?

The battery is shafted too but I don't think that's related

 

[agrimax]

If the battery is bad, it's possible the alternator isn't able to supply enough power for all of the solenoids on its own. That's assuming the controls are electro hydraulic. Just a possibility?

 

[ollandroverman]

If the battery is bad, it's possible the alternator isn't able to supply enough power for all of the solenoids on its own. That's assuming the controls are electro hydraulic. Just a possibility?

I'd be very surprised if it isn't oil over oil pilot controls.

 

[Gulli]

I'll have a closer look tomorrow after we are done tb testing.
What's to look at with the pilot controls?

 

[bazza3034]

Get a new battery as well ypu ll destroy youra alternator making it work to hard

 

[agrimax]

I'd be very surprised if it isn't oil over oil pilot controls.

Good point........

 

[Gulli]

Get a new battery as well ypu ll destroy youra alternator making it work to hard

Yeah it's on the list. Only packed up a couple of weeks ago but I'm busy with other jobs

 

[Farmer_Joe]

is the breaker pedal fully of or the main boom ofset pedal not creaping

does it have breaker lines? if you have accidentally pressed the breaker line pedal a bit it could generate your symptoms.

 

[Zetor]

What is the tracking like? Does one track go really slow when it’s playing up?
Most excavators have 2 pumps supplying various parts but it is usually 1 pumps per track motor hence the above question.
Changing oil & filters won’t make any difference, oil is filtered on the return to the tank

 

[Gulli]

What is the tracking like? Does one track go really slow when it’s playing up?
Most excavators have 2 pumps supplying various parts but it is usually 1 pumps per track motor hence the above question.
Changing oil & filters won’t make any difference, oil is filtered on the return to the tank

No breaker lines.
Tracking is fine it's only the lift ram and the dipper ram that are affected and only in one direction. Sometimes it's only slow for a couple of seconds and then kicks in with a jerk and works fine until you stop that movement

 

[Gulli]

If the battery is bad, it's possible the alternator isn't able to supply enough power for all of the solenoids on its own. That's assuming the controls are electro hydraulic. Just a possibility?

Changed the battery and it appears to be working ok. Will run it for a bit and see what happens

 

[Dylant]

What was the problem?

 

[Gulli]

The alternator died turned out to be a massive pain in the backside to replace as the regulator was in a different place. Ended up rewiring a new one in and making it fit in the gap