ls160 tilt back problems

[samsonite]

I am a first time poster, thanks for all the good info. This winter my 2005 ls160 started having problems when stacking snow. It hits the pressure relief valve when I tilt back and boom up. I verified the pressure relief valve at 2800 psi. I have been suffering slight bucket drift issues well. Any help would be appreciated.

 

[samsonite]

I notice that the hydraulics get much faster when tilting back, and they slow down when dumping. Seems to me they should speed up in either direction of bucket movment. I also notice the problem gets worse the higher the rpm, at half throttle it wont kick the pressure relief.

 

[Tazza]

I notice that the hydraulics get much faster when tilting back, and they slow down when dumping. Seems to me they should speed up in either direction of bucket movment. I also notice the problem gets worse the higher the rpm, at half throttle it wont kick the pressure relief.

Almost sounds like you have an internal issue in a ram. Some times, all be it rarely, the not at the end of the piston can come loose. It may be moving around causing the issue you are having?
I assume the issue is just tilting? not the lift?

 

[samsonite]

Almost sounds like you have an internal issue in a ram. Some times, all be it rarely, the not at the end of the piston can come loose. It may be moving around causing the issue you are having?
I assume the issue is just tilting? not the lift?

Simply put the machine works normally with lots of power until I try to multifunction the controll valve(raise/tilt), then for some reason it is kicking the pressure relief valve. Both bucket and boom work smooth and fast with good power, just not together, which sucks when I'm trying to stack 18 inches of snow! I think you are on to something with the cylinders, and the packing kits are a cheap place to start. I'm probably going to look at the bucket spool too, since I noticed it was a little wet in the front. 2005 LS160, 1500 hrs, standard flow with foot controlls

 

[Tazza]

Simply put the machine works normally with lots of power until I try to multifunction the controll valve(raise/tilt), then for some reason it is kicking the pressure relief valve. Both bucket and boom work smooth and fast with good power, just not together, which sucks when I'm trying to stack 18 inches of snow! I think you are on to something with the cylinders, and the packing kits are a cheap place to start. I'm probably going to look at the bucket spool too, since I noticed it was a little wet in the front. 2005 LS160, 1500 hrs, standard flow with foot controlls

As you state that they both work fine on their own, i don't believe it is a ream seal.
As for it going over relief while doing two functions at the same time, that is very weird. There is no reason for it to do that when operating two functions at the same time.....
Hopefully Moke has an idea about this. It's just one of those things that simply shouldn't happen. A crack between the valve sections would allow the lift and tilt to raise and fall without the function being operated, but not to go over relief....

 

[samsonite]

As you state that they both work fine on their own, i don't believe it is a ream seal.
As for it going over relief while doing two functions at the same time, that is very weird. There is no reason for it to do that when operating two functions at the same time.....
Hopefully Moke has an idea about this. It's just one of those things that simply shouldn't happen. A crack between the valve sections would allow the lift and tilt to raise and fall without the function being operated, but not to go over relief....

Thanks for the help Tazza, this is a great fourm. I'm not too impressed with this machine though, I just finished a head gasket and now I have to tear into a controll valve. I have 4000 hours on a 773 c series with not a lick of hydro problems, but it eat a head gasket at 3500 hours. Still better than 1500 hour on the ls160. sammy

 

[Mike10]

Simply put the machine works normally with lots of power until I try to multifunction the controll valve(raise/tilt), then for some reason it is kicking the pressure relief valve. Both bucket and boom work smooth and fast with good power, just not together, which sucks when I'm trying to stack 18 inches of snow! I think you are on to something with the cylinders, and the packing kits are a cheap place to start. I'm probably going to look at the bucket spool too, since I noticed it was a little wet in the front. 2005 LS160, 1500 hrs, standard flow with foot controlls

It may not be the main relief valve that is giving you the problem. There is a circuit relief valve installed in the boom circuit and possibly in the bucket circuit. If you look at the valve it sticks out the back about an 1 1/2 inch above the valve spools. These are in the system to protect the cylinders. What happens is the lift cylinders are raising and the bucket cylinders are curling. The curling operation applies downward pressure on the lift cylinders. In the right situation the combination of the lifting and curling will cause the circuit relief to open. The circuit relief pressure is a few hundred pounds higher than the main relief valve.
The speed difference you notice when raising and curling the bucket is normal. It is also normal on these units for the boom and bucket to creep down over time. It won't hurt to replace the seal kits though.

 

[samsonite]

It may not be the main relief valve that is giving you the problem. There is a circuit relief valve installed in the boom circuit and possibly in the bucket circuit. If you look at the valve it sticks out the back about an 1 1/2 inch above the valve spools. These are in the system to protect the cylinders. What happens is the lift cylinders are raising and the bucket cylinders are curling. The curling operation applies downward pressure on the lift cylinders. In the right situation the combination of the lifting and curling will cause the circuit relief to open. The circuit relief pressure is a few hundred pounds higher than the main relief valve.
The speed difference you notice when raising and curling the bucket is normal. It is also normal on these units for the boom and bucket to creep down over time. It won't hurt to replace the seal kits though.

Thanks Mike that is a great point. I may have to get a hand pump and check the main circuit relief for pressure. New holland puts it at 3500psi. Sammy

 

[samsonite]

Thanks Mike that is a great point. I may have to get a hand pump and check the main circuit relief for pressure. New holland puts it at 3500psi. Sammy

I changed out the boom circuit relief, no luck. The main relief bumps out at 2800 psi at idle. It will not lift an empty bucket and tilt back at the same time.

 

[Mike10]

I changed out the boom circuit relief, no luck. The main relief bumps out at 2800 psi at idle. It will not lift an empty bucket and tilt back at the same time.

The last post clarifies the situation better. You have a flow problem and not a pressure problem. I take it you are not forcing the bucket against the stops while trying to lift. Once the relief valve opens by deadheading the bucket cylinders nothing else will work. The first spool to receive oil from the hyd pump is the bucket spool, so if the flow is low or you have extremely bad internal cylinder packing all the oil will go to the bucket. When you get into hydraulic problems like this you just about need a flow meter to check the condition of the hydraulic components.

 

[samsonite]

The last post clarifies the situation better. You have a flow problem and not a pressure problem. I take it you are not forcing the bucket against the stops while trying to lift. Once the relief valve opens by deadheading the bucket cylinders nothing else will work. The first spool to receive oil from the hyd pump is the bucket spool, so if the flow is low or you have extremely bad internal cylinder packing all the oil will go to the bucket. When you get into hydraulic problems like this you just about need a flow meter to check the condition of the hydraulic components.

Thanks Mike, I am leaning toward the cylinder packing, just beacuse the bucket moves down first when I tilt back. The nearest dealer is 60 miles away so packing kits are cheaper than the gas involve in driving it there

 

[samsonite]

Thanks Mike, I am leaning toward the cylinder packing, just beacuse the bucket moves down first when I tilt back. The nearest dealer is 60 miles away so packing kits are cheaper than the gas involve in driving it there

Wanted to say thanks guys. I sold the ls160, you can look for me on the bobcat side.