2018 Bobcat E26 - Weak Hydraulics

[Stokes Solar]

1750 hour on the clock

 

[Dameon]

I installed the new pump that I waited 6 months for from bobcat, when cold works good at all RPM, when it warms up, you have to crank the throttle to get proper performance. I really like this machine, just cant wait to get this figured out. It almost sounds/noise like the relive valve is opening prematurely after warm.
Best
-John

Yeah, this sounds like my issue... although you're catching it earlier than I did. Sounds like the seals for the bypass in the control valve body are starting to leak. The hotter the hydro fluid, the thinner it is and the more easily it can flow through those openings.

 

[Equipment_Tech]

Not having a lot of luck finding an answer. I'm learning that the Bobcat dealer is a "parts swapper" and blamed the pump which apparently isn't the problem.

Is there a common manifold block all hydraulics go through? I would expect that there are two main manifold blocks... one for drive functions and one for arm functions. I saw evidence of this in the connections to the main pump. Four hoses.

Any thoughts?

Are all functions of the hydraulics slow ?

 

[Stokes Solar]

Yeah, this sounds like my issue... although you're catching it earlier than I did. Sounds like the seals for the bypass in the control valve body are starting to leak. The hotter the hydro fluid, the thinner it is and the more easily it can flow through those openings.

I be will using the excavator today, I may do the old screwdriver to the ear trick at half throttle under load to see which pressure relief is leaking, I believe its the main Relief valve.

 

[gwada 971]

J'utiliserai l'excavatrice aujourd'hui, je vais peut-être faire le vieux truc du tournevis à l'oreille à mi-régime sous charge pour voir quelle soupape de décharge de pression fuit, je crois que c'est la soupape de décharge principale.

bonjour , mon bobcat e26 de 2017 avec 2500h a le meme soucis de faiblesse hydraulique apres 45minute d'utilisation donc j'accelere a fond pour avoir de la force avec met l'huile devient tres tres chaudes apres .
avez-vous résolu votre problème de bobcat e26 mercie

 

[Jim A]

Check suction screen in tank for debris.
Check all stems in hydraulic valve body for broken oring plastic seals bypass especially when hot

Try AW 68 heavier hydraulic oil as a test.
Also cap each line one at a time on each function.This may narrow down what component is bypassing fluid.

Anti cavition valve in valve body or main hydraulic pressure relief will affect all functions if internal oring are broken on stem of valves .
Had a JLG boom lift no power . It was a $1.35 oring .

 

[DirtRodeo]

Thanks for the suggestions. Much appreciated. At 2500 hrs my E26 has had a weak right side for the past 200 hours. It finally quit last week. Right track does not rotate manually when lifted. Left track rotated and made a zzz sound as it went around (I stood on the end of the track to do the test). Sounded like gears just touching but not engaging. I ordered an aftermarket motor/gear assembly. I'll let you know if it fixes the problem. Also, the boom alone has never lifted the machine. Boom and stick does just fine. I really don't run it over 1800 rpm. But the suggestion in a previous post to run it at 2200 rpm makes it a mighty machine!

 

[Equipment_Tech]

Are all functions of the hydraulics slow ?

If there are all slow, I have encountered this problem many times before

 

[Dameon]

bonjour , mon bobcat e26 de 2017 avec 2500h a le meme soucis de faiblesse hydraulique apres 45minute d'utilisation donc j'accelere a fond pour avoir de la force avec met l'huile devient tres tres chaudes apres .
avez-vous résolu votre problème de bobcat e26 mercie

Bonjour. Oui. Dans mon cas, il s'agissait de quelques joints toriques dans le bloc de distribution principal des soupapes de dérivation. Le remplacement de ces joints toriques n'est PAS pour les âmes sensibles. Bonne chance.

 

[DirtRodeo]

The after market final drive or travel motor fixed my drive issue. I'm guessing that the needle bearing in the gearbox went bad. I haven't had time to disassemble it. The replacement is a little slower. I would like to have the original rebuilt but haven't found a shop to do it.

 

[DirtRodeo]

Bonjour. Oui. Dans mon cas, il s'agissait de quelques joints toriques dans le bloc de distribution principal des soupapes de dérivation. Le remplacement de ces joints toriques n'est PAS pour les âmes sensibles. Bonne chance.

Merci Dameon. Le motor travel est le problem.