Polar Mohr 137E Repair

[Gizmo]

Good afternoon.

Polar Mohr 137E (E/C, CP5, V4.0.0-0)

Please could you help me identify the cause of the fault?

The cutter (working unit) was moved to a new location. We reassembled it after three months of storage.
Problems:
1. Error 133 (D1-off, D2-off, D3-off, D4-off, D5-on and D6-on - Protect. areas were never ‘unobstructed’ since ‘Voltage ON’)(measurements on SK95 – 24V/12V/5V within limits)(measurements on emitter and receiver within limits)(repositioned the working barrier from 78ES – to no avail).
2. No pressure is being built up in the hydraulic system (the pedal is not being held by the valve) (Figure 1).

Consequently, as there is no pressure, the pressure beam does not lower.

Thank you for your help.

I’ll try to reset the Service menu tomorrow (take photos of the parameters) and take additional measurements in the circuits.

Please advise how the safety bolt should work on this model (and how to check it).

There is a suspicion that during final assembly and transport using a forklift, the mechanic rested the pressure plate against the forks and moved the machine in this way. Could the heavy weight (of the machine) applied to the pressure plate have damaged the mechanical components or the hydraulic system?

Photo

 

[Gizmo]

I have read the publicly available manuals (for the various machine series) and have not found a solution.

Proposed repair sequence:

1. Repair the hydraulic system.
2. Once the hydraulics have been repaired, the gearbox should start.
3. If the gearbox does not start, the clutch or the gearbox’s hydraulic lock must be repaired.
4. If the gearbox starts, the safety bolt will unlock.
5. As a result, the protection in the CP will be unlocked.
6. The light barrier will then change its indication (or may not change, in which case the emitter and receiver will need to be aligned).

 

[BEAutomation]

If there is no pressure, did you check the order of the phases of power line? This happens a lot after relocations.
If L1 L2 L3 (R,S,T,) are in the wrong order, the motor will rotate in the opposite dirrection and the hidraulyc pump will not build up pressure.

I know it is silly but I better ask.

 

[Koenig]

I have read the publicly available manuals (for the various machine series) and have not found a solution.

Proposed repair sequence:

1. Repair the hydraulic system.
2. Once the hydraulics have been repaired, the gearbox should start.
3. If the gearbox does not start, the clutch or the gearbox’s hydraulic lock must be repaired.
4. If the gearbox starts, the safety bolt will unlock.
5. As a result, the protection in the CP will be unlocked.
6. The light barrier will then change its indication (or may not change, in which case the emitter and receiver will need to be aligned).

If you suspect the hydraulic unit, just have a look on this thread (post earlier), if your hydraulic system in similar, it can help, and if not share the images of the machine, and hydraulic system.

Post in thread 'Polar 115 clamp system'

Mar 31, 2026

Dear, have a look on the attached picture, tried to make it simple and easier for any Tech/non-tech individual. Sluggish clamp movment means, either less pressure or leakage on cylinder or faulty valves.

Try this:
Turn On main motor --> Open hydraulic unit's cover and have a look at the hydraulic unit --> ask operator to press foot padel and have a look if there is any leakge at the valves/main cylinder (Cylnder is behind this Hydraulic unit), --> Now enable cut (because when the cut is enabled all solenoid valves operates and you can observe the leakage. If no leakage is observed...

• Koenig

 

[Gizmo]

Good afternoon.
Thank you for your help.

We checked the phase connections before starting the motor. The motor is rotating clockwise.

 

[Gizmo]

Good afternoon.
Thank you for your help.

The photos are attached via a link in the main post.

The problem is that the hydraulic system won’t start at all.
In P1 (the pedal pusher), the hydraulic mechanism isn’t even applying pressure – the pedal pusher is in a free state and can be moved with your fingers.
The cutter clamp does not respond to commands.
The blade does not respond to commands.
The control system shows no errors; there are no (visible) error indications on the SAP or SK.

Possible faults:
1. The hydraulic pump is not building up pressure.
2. There is a leak in the hydraulic system at idle pressure – which prevents the pressure from rising even slightly.
3. Something has happened to the P1 or P2 valves (specifically the solenoids).

And a very important point which – as is suspected – may have contributed to the failure.
There is a suspicion that during final assembly and transport using a forklift, the mechanic rested the pressure plate against the forks and moved the machine in this way. Could the heavy weight (of the machine) applied to the pressure plate have damaged the mechanical components or the hydraulic system?