Polar115 Cutting Machine Repair

I think you have 2 problems going on here.

If you aren't extremely good at hydraulics and very familiar with this machine then DO NOT attempt to make these adjustment yourself. These are very sensitive machines and can cause serious damage to the machine or you.

First of all I think your going to have trouble making the necessary Adjustments as it takes a pressure guage with a specific fitting on it to make the necessary adjustments.

If you have the proper guage then you can adjust the pedal pressure inside the hydraulic tank. There are 3 solenoid valves in there and on the valve body are adjustments. Valves are to be set to very specific bar pressures and are generally listed on the cover of the hydraulic tank as well as what each valve is for.

Thre will be a listing for which model of machine you have and beside it the bar pressure for the particular valve. Usually this diagram is brown with white text on it.

As far as your auto clamp goes I think it could be the delay timer on the front panel that might be giving you the problem. It may be set to quick. you can delay the timing between the clamp and blade for up to 30 seconds. By turning the dial with the little clamp symbol next to it, one click at a time, you can lenghthen the time by about 1/2 second per click. That might help with the auto clamp bit. If not then the valve adjustments will fix this.

Again if you are not very familiar with this machine then please let a qualified Heidelberg technicinan make this repair for you as it can be very dangerous to you machine and you.

If improperly adjusted the clamp can far exceed the mechanical stress points of the machine. I have about 25 years experience with this equipment and know the dangers involved.

Normal disclaimers appply: Not responsible for anything.

Thanks for reply,

there are two solonoid valves in valve block As I think one is for clamping, other is for knife and as I understand knife should come after clamping pressure reaches upto desired lavel and no electrical delay timer should involve.I have chacked both relive valves, are ok pump is ok but between pump and valve block what hydraulic circuit is given because it is dificult to open every think.

What you should have 3 valves. Each having an electric solenoid.

The valve bodies are directly behind the solenoids. you are correct in that there is a cut valve and a clamp valve. there are actually 2 clamp valves, a low pressure which is for manual and a high pressure which is for auto.

Clamp pressure is controlled by a control knob on the upper right hand side of the machine. Clamp timing is controlled by the knob I described in the previous post.

On the valves is a pipe with a large nut with a ball bearing in the center. These are the check valves. Theere are also on each valve a nut with a bolt in the center. These are the pressure adjustments. You must have a pressure guage on the valve before adjusting. the pressure guage goes on the releif valve with the nut and bearing removed. Pressure guage needs to be able to read at least 25 bar. set pressure according to fron panel of the tank.

Also ther is a filter in the bottom of the hydraulic tank. You will find it in the backof the tank in the bottom, right hand corner. It is a fine steel mesh and need to be very clean. Normal cleaning solvent will work fine just make sure it is dry before putting it back in. Yes it is underneath all the oil.

Check your oil temperature make sure its not above about 100 degrees that will indicat if you have blockage or not also look for bubbling or milky looking oil in the tank this is going to tell you if you have a seal leaking on a valve or not.

when you cycle a valve like the foot pedal valve, the bubbles will increase if it is drawing air on that valve.

Lastly, check the pump belts. They are located on the right side of the machine and at the bottom driven by a single v-belt. Ther should be no more than 3/8" of play on that belt, or it will slip causing a pressure loss.

Let me know how you get alon with that. I have been v ery busy the last couple of days so I will responde as quickly as I can.

Thanks Jb

After rechacking every part according to your instruction I will tell you what happend.

Just let me know what I can do to help.