NEW EXCAVATOR HYDRAULIC PUMP NOISE

[Drew]

HYDRAULIC PUMP NOISE AFTER START

Is it normal for a new excavator to have a noise coming from the hydraulic pump when cold(after first start every time even if it’s been used then say for 1 hour)
I’m sure when the machine first was used it never made the noise, it seemed to start after the fitter came out to fix a small leak. The noise is like a grumble and sometimes the machine judders.
I’m just want to make sure it’s not some cavitation or anything els that could cause some pump damage from excess wear. The fitter seems to think it’s normal but I don’t want it to bite us in the arse when the warranty expires. Any help would be greatly appreciated.

 

[DaveDCB]

What machine is it out of interest?

 

[doobin]

What machine is it out of interest?

Whatever machine it is it’s not normal and should be addressed. will be interested to hear the brand, I’m guessing Chinese micro.

 

[Drew]

I thought so.It’s a doosan/devlon

 

[craig]

HYDRAULIC PUMP NOISE AFTER START

Is it normal for a new excavator to have a noise coming from the hydraulic pump when cold(after first start every time even if it’s been used then say for 1 hour)
I’m sure when the machine first was used it never made the noise, it seemed to start after the fitter came out to fix a small leak. The noise is like a grumble and sometimes the machine judders.
I’m just want to make sure it’s not some cavitation or anything els that could cause some pump damage from excess wear. The fitter seems to think it’s normal but I don’t want it to bite us in the arse when the warranty expires. Any help would be greatly appreciated.

I may seem obvious, but did they top the oil up after fixing the leak?
If its a small machine it wont take much of a leak to run low.

 

[V8Druid]

I thought so.It’s a doosan/devlon

what size machine ... VDP or fixed pump(s) ??

 

[DaveDCB]

Whatever machine it is it’s not normal and should be addressed. will be interested to hear the brand, I’m guessing Chinese micro.

I’m interested to see which manufacture is fobbing this off as normal, thus to avoid them

 

[hiluxman]

I thought so.It’s a doosan/devlon

Model number would help too.

Develon/bobcat have a loud pump in general. But if its new then it may be a develon/hyundai machine.

 

[Drew]

what size machine ... VDP or fixed pump(s) ??

Dx85 I’m 99% sure it’s VDP

 

[Drew]

Model number would help too.

Develon/bobcat have a loud pump in general. But if its new then it may be a develon/hyundai machine.

Dx85-7

 

[Drew]

I’m interested to see which manufacture is fobbing this off as normal, thus to avoid them

I’ll speak with the fitter tomorrow if it’s not 100% normal

 

[DaveDCB]

Try and get a video of it, will soon tell you if it’s normal or not.

I had a machine once with a poor hydraulic pump and had it replaced(and loss of other bits!), new one was a closed centre and that was a lot louder, but much better pump & setup than the previous one.

 

[Mick-the-fitter]

Where was the leak?

 

[Drew]

Where was the leak?

Small leak on the levers and on the blade check valve

 

[Drew]

Try and get a video of it, will soon tell you if it’s normal or not.

I had a machine once with a poor hydraulic pump and had it replaced(and loss of other bits!), new one was a closed centre and that was a lot louder, but much better pump & setup than the previous one.

Tried to get one today. Sod’s Law it didn’t make the noise

 

[Mick-the-fitter]

Sounds like pilot issue so far

 

[DaveDCB]

Would a blocked pilot filter then cause issues in the main hydraulic filter?

The pilot filters never seem to get swapped & are nearly impossible to find sometimes!

 

[V8Druid]

Would a blocked pilot filter then cause issues in the main hydraulic filter?

The pilot filters never seem to get swapped & are nearly impossible to find sometimes!

only had a few hour's use Dave ... could be a check valve or main PRV playing up 'praps ......
this (bloody pic won't load Doosan DX63) had a check valve issue on the boom cylinder that was making some very strange noises when it arrived

 

[Mick-the-fitter]

Would a blocked pilot filter then cause issues in the main hydraulic filter?

The pilot filters never seem to get swapped & are nearly impossible to find sometimes!

Not sure on that machine if it’s a remote pilot filter or in the supply to the servo lever hoses?

 

[V8Druid]

Not sure on that machine if it’s a remote pilot filter or in the supply to the servo lever hoses?

'Drema has the servo filter in the block with the dead man solenoid cut off, which supplies all of my servo circuits - sticks, boom pedal, rotate pedal, blade/legs lever, axle locks, brake pedal, slew lock and transmission motor/2 x 2 speed box and is a washable item
can't put up a pic ... won't load