Chinese Mini Excavator: Low Hydraulic Power? Checking and Setting Relief Valve

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The Garage Connection

4 ай бұрын

Пікірлер: 68

@CGreciful 4 ай бұрын

Found out about your tester kit 8 mins ago, ordered it 5 mins ago, now the video is over. Keep at it.

@user-jw9nu6rp9t 4 ай бұрын

Thanks for the video series. I always learn something! How about selling or showing us how to make a quiet muffler for these machines? Just a thought.

@AnufrijevZoran 4 ай бұрын

Thanks a llot for sharing your expiriance with as.Great video.

@DiggerDaveSea 4 ай бұрын

Thanks for the video. I never expect to need to do it, but nice to know how just in case.

@flatlandersfilms 4 күн бұрын

I would like to see the modification video. I have a l12 and plan on putting this thumb on too.

@ihnas2578 3 ай бұрын

Excellent video series great job in explaining

@GlorytoGod580 4 ай бұрын

Awesome video as usual are you able to make a video on expanding the hydraulic system with them threaded expansion tubes? I don’t understand how to use install it and there is no videos on it anywhere but everyone seems to want to do it. Keep it up

@XanderFreeman88 2 ай бұрын

Can you do a video on the pilot relief valve on the 15 models ?

@pauljacobson9266 Ай бұрын

Hey Cam, your videos are extremely helpful. Much appreciated. I have a Shandong Longsheen LX06-9 mini excavator. Very similar to yours. I was having issues with the high speed travel not working and low machine performance after using it for a while. The high speed travel would work intermittently, then not not work at all. I do understand this is a flow issue to the travel motor, but I had suspected the hydraulic system was dumping before the high flow would kick in. The motor would start to rev up, but would immediately rev down as it dumps. I put a test gauge setup on the auxiliary hose and find that the system relief valve setting is only able to be adjusted to ~800 - 1000 psi. Pulled the relief valve several times, appears fine. The system does remain at the same pressure after releasing the actuator. I have also tightened the 3 valve manifold thru bolts as suggested to another. Frustrating issue. Do you recommend I replace the relief valve? Any device sourcing Chinese excavator parts? Again, much appreciated, Paul - Rhode Island

@weskolpack 14 күн бұрын

Hello hey I have a mini excavator that crawling supper slow can this adjust ment help

@2stroketurbo 3 ай бұрын

nice

@user-nh4pq2rs2h 3 ай бұрын

Great video , if you dont mind the question for a kubota d902 , on a chinese 3500 lbs 1.8 ton , will it still be like 2500 3000 psi ?

@thegarageconnection 3 ай бұрын

Yes it will. Engine choice does not dictate PSI setting

@joshgreen765 3 ай бұрын

Hey Cam. Been enjoying your videos. I appreciate all the knowledge you have been spreading. And how you show in detail the aspects of what it is you are advising on. I have a question pertaining the hydraulic function of the tracks. Is there a way to boost power to just the track system? I’m finding it difficult to climb my hillside or even getting up the ramps on the trailer. Power seems good everywhere else. Thanks in advance for any advice on this issue.

@thegarageconnection 3 ай бұрын

What model unit do you have

@joshgreen765 3 ай бұрын

I have the 2024 miva va13. I had a thought. That maybe it’s the fluid itself? I was wondering about using a 68 for viscosity? I noticed it may have lost strength after heating up.

@Michael-tu4gm 2 ай бұрын

@@joshgreen765 same problem with my machine it wont turn or move up hill well. ive replaced the pump and it worked great for an hour then stopped. I took out the relief falve and cleaned it.. didnt help

@chiefkyle1098 4 ай бұрын

Ironically, I had this problem Sunday. I was trying to turn the tracks, and the left track didn't want to turn forward. I pinned the lever to only put pressure to the track motor and didn't have enough flow to turn. I could hear the tail-tale noise of bypass valve kicking in. I ended up using the bucket and boom to turn me. Not sure if internal seal leaking or bypass pressure set too low. Will check in a couple days. I have a PSI gauge on my hydraulic forge press.

@thegarageconnection 4 ай бұрын

Tighten the DCV valves clamping studs

@5.43v 3 ай бұрын

@@thegarageconnectionwhat's the dcv valve?

@5.43v 3 ай бұрын

I have the same issue, what was your solution?

@thegarageconnection 3 ай бұрын

@@5.43v they are the valves that control the hydraulics. They’re all held against each other by long studs that run through the body of the valves with nuts on each end

@patrickwong2823 4 ай бұрын

Hi Cam. Another good video. I'm still working on solving the problem of jerky controls. Question: would lowering the pressure in the relief valve slow down or smooth out the jerky movement of the bucket, stick, boom and tracks? Also, are there two relief valves - one to control each side? Thanks in advance.

@thegarageconnection 4 ай бұрын

One system relief valve to control the whole thing unfortunately. If you did lower the relief valve pressure you would severely effect your machines ability to lift

@chiefkyle1098 4 ай бұрын

Same issue, but only with the tracks. If only moving one track, no matter how slow I ease into it, it jerks.

@AA-tb4ff 4 ай бұрын

@@chiefkyle1098 this guy knows more than me probably about everything but on a log loader the grapple rotate circuit has a cushion valve so it starts and stops smooth and has it a bit if give if you bump it into something. maybe something like that can be put inline with the track motors?

@fckmunch 3 ай бұрын

Is the Rhino XN12 series any different to the machines in your video's, or are they all just about the same with a different skin? Is the reliability the same throughout? Edit: I'm looking at swaping out a Kubota 3 cylinder diesel from the koop model. I've heard the koop is noisy, but I'm curious on your thoughts? Cheers

@thegarageconnection 3 ай бұрын

I’ve heard good things about the Koop

@landscaperconnection 4 ай бұрын

Hey Cam. Tested my pressure because my machine, once the fluid gets hot it won’t turn easily if at all…a zero turn is impossible. Pressure was a little low, as a tightened that Allen screw the pressure went up but then as I held the lever it started to leak down. I cleaned the relief valve but does this seem like the whole valve is bad? Thank you. Your videos are great for these things, great content.

@thegarageconnection 3 ай бұрын

I think your valve body rods are loose. Look on the end of the DCV block and tighten the 3 nuts down hard

@josephowens2337 13 күн бұрын

@@thegarageconnection I have one of the vevor test kits but there wasn’t any adapters that fit. I couldn’t find the adapter online what size do you need for the one that has a 10 on the fitting

@dfk8881 4 ай бұрын

So, this AgroTK machine was delivered with only 500psi system relief setting? If so, that's a new low. I have seen numerous 1500psi settings, but my first machine (XN08) was right at 2400 from the factory. 2400 to 2500psi is recommended. Good job on the video.

@thegarageconnection 4 ай бұрын

I suspect my valve body was loose and bypassing the pressure

@dfk8881 4 ай бұрын

Interesting. As you already know, the valve stack uses large single O-rings between each section. I would expect to see a significant external leak if what you describe happened. Once you tightened up the bolts, what was your system pressure?@@thegarageconnection

@jeremyc9229 4 ай бұрын

I had a track get stuck going forward, even though the handles were in neutral. Had to pull back the opposite way, then it stopped. Less than an hour on the machine.

@thegarageconnection 4 ай бұрын

Loose tracks can get caught up on the mounting plate of the machine

@jeremyc9229 4 ай бұрын

@@thegarageconnection what I meant to say was, the valve stuck open, and the machine continued moving even though I released the handle. To stop moving, I had to pull the handle back the opposite way, then release. It only did that once. I am wondering if a piece of debris was flowing through the valve at the time I released the lever. Anyway, I think I will replace the hydraulic fluid and check out the inside of the tank. Thanks!

@androidtv9815 4 ай бұрын

What is your opinion on whether the boom cylinder is better on top or below the boom? Some argue that if it's below, it has more power to lift. Of course, it is better protected on top.

@thegarageconnection 4 ай бұрын

Hydraulic principals dictate it has more power when in front of the boom

@androidtv9815 4 ай бұрын

Yes...that is true. They just seem to offer upper side cylinder type of machines and I have hard time to deside If I should by one or not.

@androidtv9815 4 ай бұрын

It is similar to ht20 2ton machine

@DCOJos 4 ай бұрын

Where do I send an email to get the cooler kit? I can’t seem to find an email address on your site.

@thegarageconnection 4 ай бұрын

Centraldiggersupply@icloud.com

@backwoodsales8260 4 ай бұрын

Would this cause the drive motors to run hot?

@thegarageconnection 4 ай бұрын

No, the high fluid temp will though

@megamind1861 4 ай бұрын

Hello Sam I have this similar problem as the video I ordered your pressure gauge but it did not fix my problem I increased my pressure it was low but my machine seems to power out at about 1000 PSI and now the machine will kill as I use my hydraulics

@megamind1861 4 ай бұрын

H15

@TELEDOBAYRON1 3 ай бұрын

Need some assistance. I bought the pressure test guage and did all the steps, but I am still losing pressure when I am in a hill. What do u think it could be the problem?

@thegarageconnection 3 ай бұрын

Do you have an L12 or KAT12 style machine?

@TELEDOBAYRON1 3 ай бұрын

@thegarageconnection I have a HT08 excavator

@phloughtgnarpsehs7263 4 ай бұрын

Important to have the system warmed up before adjusting hydraulic pressure. Not just the engine, but especially the hydraulics. And of course, also a huge no-no to start a cold engine at full throttle.

@megape95 4 ай бұрын

All the small generators i know of just go on full throttle right away. No big deal. Just dont load it all the way instantly. At 30-40°c the hydraulics hould work as intended. Otherwise the hydraulics are badly engineered

@phloughtgnarpsehs7263 4 ай бұрын

@@megape95 no big deal until the engine needs an overhaul considerably earlier than if it was given time to warm. In the case of generators, it’s by design that they have to start up at operating rpm. But it’s not ideal. They of course experience more wear as a result, compared to engines that are allowed to warm up at idle. It’s why there’s a throttle control on these units. Not just on or off. As for hydraulics, you are correct that at 30-40c, the hydraulics should work as intended. Thats typical operating temperature. And operating temp is when relief valves should be adjusted. Not cold. Hydraulic oil has much different flow characteristics when cold. If the valves are set to a particular pressure when the oil is cold, you’ll find the relief pressure has changed when the system is up to operating temp.

@6Diego1Diego9 4 ай бұрын

man Chrysler ripped off BMW when they made they made Jeep Compass. That should be a crime.

@AA-tb4ff 4 ай бұрын

i think thats punishment for chrysler enough. i wouldn t wanna foot the warranty bill

@archerydezign 4 ай бұрын

I have a 1.8T machine and if just a bit of sand gets between track and the track wheel it won't turn. You know why it might be? I use my machine on sandy soil only and anytime too much sand gets in there I have to move back and forward again to clean it

@thegarageconnection 4 ай бұрын

Sounds to me like you have a low pressure issue

@archerydezign 4 ай бұрын

is it the pressure for whole system or just the track? I assume the pressure relief valve is for the whole system?@@thegarageconnection

@thegarageconnection 4 ай бұрын

@@archerydezign correct it’s the sole pressure setting device of the whole system. If the valve body is loose fluid will simply go right to the return side bypassing the valve

@user-fj1km1oq4u 4 ай бұрын

Have one of these machines and one side and one direction has no track movement (foreword right side) have you had this issue?

@thegarageconnection 4 ай бұрын

Will it go the opposite direction?

@user-fj1km1oq4u 4 ай бұрын

The right side will go backwards but not forwards. Left side is normal and works well

@thegarageconnection 4 ай бұрын

@@user-fj1km1oq4u I’d recommend switching the hoses on the track drive motor and see if you can determine if it’s a motor issue or a hydraulic valve issue

@user-fj1km1oq4u 4 ай бұрын

I tried that and it didn’t make a difference. I did notice that the output shaft has a slight leak which tells me I may be building case pressure in the motor. Hard to find these motors too.