94 7740 hydraulic filter light goes on after some time

[Mikin87]

Hi.
I have a 94 7740 that after a couple of hours of work the hydraulic filter light start flickering. I have changed all filters 8 hours ago. Any Idea?

 

[2wheels]

check the pressure sensor. they sometimes weep oil in which case it will be knackered.

 

[forblue]

Can you be more specific about what model you have when asking a question as it will help in answering in more detail, what hyd system ccls or two separate pumps, 12 x 12 with or without dual command, or 16 x 16 transmission, quad mod or pre quad, what instrument cluster eic or analogue, also full edc or manual lift, also can you post photo of light or describe it....

 

[ridger]

Mine used to do that at tickover, now it ticks over at 850 revs instead of 650 and no more problems

 

[forblue]

Idle speed set at factory was 725-775 rpm.

 

[Mikin87]

Sorry. It's a 94 SLE 16x16 with digital display. The light starts justly to flicker when I mow on small fields or other job's which there is a lot of turns and/or lifting the front loader or the tree point in the rear. The light is of an filter with two drops in it.

 

[agrimax]

That's the light for the steering filter.May be the sensor on top of the filter housing is faulty.That's the smaller vertical filter to the rear.

 

[Mikin87]

That I have already tried. Changed it . Didn't help.

 

[forblue]

Also indicates hyd pump charge pressure low ,which is most likely due to pump wear and or transmission loss again due to wear, have you also changed the oil, if so i would suggest a pressure check to see how much below min you are...

 

[Mikin87]

Ok. Then I will look into that

 

[Mikin87]

Is there any way to check the pressure my self? And if so. What pressure should I have at an given rpm? If the pump turns out to be bad. Is there any rebuild kit to buy or must I by a new pump.