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- เผยแพร่เมื่อ 5 ก.พ. 2025
- CAT 416C Backhoe. The bucket lift suddenly became very weak and would hardly lift half way up. Working another control would seem to make the bucket lift momentarily. All the other hydraulics still worked flawlessly. The problem turned out being the o-ring seals on the check valves(resolvers) in the hydraulic valve group.
In my internet research on the the symptoms I was having others have reported the same problems and said that this problem is the result of the pump not being triggered because a blown out seal in an adjacent control valve in the control group. In most cased the check valve for the valve for the control that is not working is not the issue but another one in the control network.
Here is some reading I found helpful:
www.heavyequip...
www.scribd.com...
www.justanswer...
Great video and very detailed! Appreciate all the time researching this to give us all a video on how to properly due it safely.
Just changed seals on check on side of 428c. Works like a dream. Million thanks.
Awesome!
Thank you thank you l bought a cat 428B it stand 7 years so many peoples want buy from me l keep it nou l get it right thanks so much for you info!!!
Extremely helpful. New seals below did not help 428c lift bucket. Going to try side seals. Thanks a lot. Must have taken a lot of extra time and effort.
Glad I could be of help!
Good video...... Fluid goes from oil tank to the filter to the pump to the control valves then to cylinders, any trash returns back to the bottom of tank. if it floats around the filter will catch it before it goes back to the pump and components. I'm getting ready to do ALL my control valves and you have been tons of help. Thanks you sir !!!!!
Happy I could be of help. Note that on my machine the fluid tank directly feeds the pump before being filtered. The fluid is filtered before being returned to the tank. My guess is if it were filtered before the pump there would not be enough pressure to push the fluid through the filters and the pump would be starved. I think this is a common setup with hydraulic equipment.
Getting ready to do mine now on Cat 416. Thanks for the great detailed video!
Hope it goes well for you. Mine is still going strong after the repair.
Got the same issus with my JD 310sg so thank u for the video. Very informative.
thank you for explaining what the symptoms were as i had the same symptoms and am going to fix my excavator. so now I'm just going to get on with it. Thank you
I started doing my 416 today with official o-rings. One set of the O-rings actually had Catapillar written on each oring ,in tiny print,with the part number, pretty amazing. THESE ARE NOT JUST some OVER PRICED Horrible Freight o-rings , they look and feel very special.
Some of mine had part numbers on them too. I was impressed as well. You get what you pay for. From my limited experience CAT has good quality stuff. And the support from the dealership has been great. I've ordered parts at 4pm and had then the next morning ready for pick up at 7am several times.
Gracias amigo desde México,
Thank you for this fantastic video. I had same problems with hydraulic on my Caterpillar 438B. First I replace seals on resolver 1, after some time issues came again because of resolver 2. My question is, are there some other seals on the hydraulic valve that should be changed to prevent similar stops. Thank you.
I'm happy to hear I helped someone. I'm not really an expert and don't know what else could cause this problem. All I can say is make sure you have checked all the resolvers. Best of luck.
Thanks allots for ‘tis !,
So I did this and am still having problems with the loader bucket not lifting. Also the power steering gets difficult to turn every once in awhile Also, the loader joystick catches when I move it all the way to the left (curl). Any ideas?
I lifts VERY slowly when I rev the throttle all the way up.
@@jerweave From what I do know if the bucket lifts better when another hydraulic circuit is activated then maybe there is another resolver somewhere that has a problem. If the bucket shows no improvement when activating another hydraulic circuit then maybe its something else. I don't know why the joystick catches or if its a related issue. Just my best guess. I'm not on expert on hydraulics. Best of luck getting it sorted out.
Make sure and check out the links I put in the description.
hello sir. i have caterpillar 416e but bucket loader can't lift and steering wheel so hard to turn. can you solve this issues.? thanks
Sorry I'm not a hydraulic expert, just shared what experience I had with bad resolvers.
I am no professional, but I have a 420f and the Backhoe stoped working with the stabilizer arms, any idea.
I'm not an expert on these either. Best I can say is if it starts working when you activate another control it might be the same issue I have. Else I really don't know. Keep searchin around on the web there is lots of info out there. Best of luck.
I like this tutorial on how to get the diagram
Thanks for the feedback.
Thank you.
Im having a steering issue on my 416e backhoe. No steering unless i tilt bucket at same time. Then my steering works . Do you think its same issue o rings?
I haven't had a problem with steering and I'm not an expert on this but from what I read it sounds like it's probably the o rings like in this video.
@@Goldenfab thank you. Ill try it out. Thanks for the vid!!
@@xtremegearheads Did you get the problem fixed? What fixed it?
@@cornbobrimlove7892 yes it was the o ring in the spool.valve. ringb blows out and jamed valve one way and if you un stick it. It will still bleed out no power to lift
Great video. ! Nice job..I've got the same problem
Can you give me the part numbers for all 3 o rings.?
Check out www.parts.cat.com it's easy to use and you don't need an account to lookup part #s last I used it.
now I know, thx man....
How can i get in touch with you my friend i have seen your videos and you cant explaint it better .....i need some tips!
You just did. What's up?
I have the same problem with a 416B i replaced the 2 valves the long ones ,cause someone told me the tip shouldnt move at all so i put 2 other ones and those move too but just a lil and it did work but the rear is weak too . I already cheked all seals on both valves 1 and 2 on both valve bodys and they good,,,i repeat the front is good now
@@gustavodemeneghi2599 On my machine there is a valve control group in the front for the front loader and one in the back for the rear bucket. If I remember correctly any one of the two types of check valves in either of the valve control groups could cause the bucket to be weak. If you activate another hydraulic control like the loader at the same time does it make the it make the rear stronger? If so it sounds like one of the seals for the check valves is bad. If it makes no difference maybe the problem is somewhere else. I hope this helps. I am not an expert on these I just happened to figure out what was wrong with mine so I wanted to share with others.
If i do activate another control yeah it gets very strong specially if i activate the front one at the same time .....actually i just got done pulling out and cleaning each of the 12 valves on the rear 6 long y shorts all seals good after done it did work for few seconds then got weak again.....can you verify if u remember how did your valves looked like ? Did the tip on each one got movement or was all adjusted?
@@gustavodemeneghi2599 the long check valve that is called a "resolver" by caterpillar, yes the tip I remember was loose. I remember though I could blow in one end and it would seal and the other it would pass air through.
It sounds like you have the same symptoms I had. Was there a blow o-ring seal in one of the check valves that possibly broke free and has plugged up something inside the hydraulics?
Pompe hydraulic cat428 serie2 originally
I haven't worked in that model m
Those nice Cat engineers!
Tarzaan yeah a lot nicer than the guys over at Navistar. I started pulling apart my 6.0 today to replace the oil cooler. So far I don't have anything nice to say about them...
Adam Goldenstein why pull apart a 6.0? Arent they flawless?
Well you see... Using it for only one boat anchor would be a total waste.
that back up ring probably just rotted away, thats why u cant find it
حودة الصعيدي
I'm having internal leaks with 430d model and its like the hydraulic block was built by a retard yours is so much easier I just can't believe it
Hope you get it sorted out.
Haw match join valve algeria
Sorry I don't understand.
What language do you speak dude?
stop saying HUUM HUM HUMM ..so annoying