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Troubleshooting (10)
Where do I call for technical support?

For answers to technical questions, call our Contact Centre in Woodstock, Ontario at (877) 276-7297.

What do the X Axes / Driver Alarm Codes Mean?


99 SHS Transmission/Reception 94 Micro zero-axe in-congruent
98 SHS In-congruent reception 93 SHS phases short circuit
97 Micro zero-behind 92 SHS driver over temperature
96 Micro zero-axe always OFF 91 SHS over/under-voltage
95 Micro zero-axe always ON 90 Non-existent phase zeroing



Possible Cause


Disable drive Press Reset. If display doesn’t show “r” letter, please check limit switch, emergency circuit,…


Enable and ready drive Ready to march.


Phase motor short circuit Check the connection on driver and motor.


Hi or low voltage supply Check the power supply voltage, transformer, connections.


Over temperature Check if fans inside the cabinet are turning properly, fuses…
How Do I Stop the S-20P III Blade Cover Open Alarm?
  1. Check that fuse F5 has not failed; if this fuse has failed you’ll see that error.
  2. Do you have 24vAC at wire 052 at the K7 relay? 
  3. Does the relay coil energize and change the states of the contacts on the relay when the blade cover is closed?
  4. Does voltage pass from wire 052 at the K7 relay thru the relay and out of the relay on wire 032 and do we see 24vAC at the PLC input terminal that is labeled 032?
  5. Jump 24vAC direct to input 032 at the PLC.  If no improvement fault is internal to logic control board and would need to be replaced.
Troubleshooting H-10A Safety Relay Circuit


The Safety Relay, has 2 led indicators, both must be lit indicating that the safety circuit is satisfied.  Without that circuit closed the machine will not start.

If turning the key switch on the front of the control console on starts the hydraulic motor this indicates that the safety circuit is not complete.  The key switch bypasses both of the door interlock switches and the emergency stop push button.


Safety Circuit Schemata

Safety Circuit Schemata


Testing / Troubleshooting

The object is to see both of the led’s on the safety relay light up. Check for 24vDC on the output side of the 7FU fuse before starting the troubleshooting process.

First – Use a jumper wire connected to terminal OvDC and connect the other end of the jumper wire to terminal HS3, if no change in condition move the wire from HS3 to HS2, if no change, finally connect the end of the wire to terminal A2 at the safety relay.

If no change, remove the jumper wire from terminal OvDC and from terminal A2 at the safety relay.

Second – Connect the jumper wire to a terminal labeled 24vDC and connect the other end of the jumper wire to terminal HS1, if no change remove the jumper wire from terminal HS1 and connect to terminal A1 at the safety relay.



My saw runs, but I have no hydraulic functions or any pressure showing on the system pressure gauge.

Between the hydraulic pump and motor there is a bell housing containing a three-piece coupling. Inspect the coupling to see if one of the flanges has loosened off and slid apart. If it is necessary to re-connect the coupling, use removable Loc-Tite on the set screws, or if the coupling is damaged, it will need to be replaced.

With new saw installations, if there is no pressure showing on the system pressure gauge, it is likely that the phase wiring is backwards. Reverse any two of the three phase wires supplying power to the saw.

Hydraulics will not stay running after the start button is released, Mitsubishi controlled machines.

1. The Out of Stock Limit Switch is activated.
Action – Check to see that the Out of Stock Limit Switch is not closed.

2. There is a short circuit in one of the 24v dc devices (Length Encoder, Feed Rate Encoder, Angle Encoder or Proximity Sensor Switch or the associated cables for these two devices) on the machine.
Action – To find the fault, disconnect the wires that supply power to the devices. These wires take 24v dc power from two terminals located on the input side of the Mitsubishi PLC control. The terminals are labeled as 24v and S/S. Disconnect the wires, then start the saw and ensure that the hydraulic circuit stays “latched”. At that point turn the power off then reattach one of the two wires, then start the saw again. In this manner we will located the faulty circuit. Once the faulty circuit has been found then they can use the information in Section 3 of their Operations and Maintenance Manual to troubleshoot the problem.

3. If disconnecting the wires as noted in number 2 above does not resolve the problem.
Action – Check for an active LED input at the status indicator LED’s found on the top of the PLC. Particularly we are interested in the BATTERY ALARM LED’s and the PROG-E / CPU-E alarm LED’s. If the PROG-E / CPU-E alarm LED is flashing this means that the program in the PLC is corrupted. If the LED is not flashing, but is lit and steady then there has been a CPU fault, this means that there is a hardware problem in the PLC control and it would need to be replaced.

4. Check that output Y0 led is lit when pushing the Hydraulic start pushbutton. Check that wire 1M7B (wire number varies) is connected properly at Y0 terminal of the PLC. If no improvement is noted disconnect wire 1M7B(wire number varies) from the Y0 terminal and measure voltage from the Y0 terminal to Neutral terminal. DO NOT check with wire attached to Y0 as the connected wire will backfeed voltage to the Y0 terminal. If no voltage is found PLC output Y0 is defective. Check Fuse 5FU1, if fuse condition is good and proper voltage is measured record all input and output leds’ found lit on the PLC control when hydraulic start push button is pushed and contact HYDMECH’s service department (877) 276-7297.

If voltage is present at Y0 check reconnect wire 1M7D (wire number varies) to Y0 and check that the other end of wire 1M7D (wire number varies) is properly connected to H1 terminal. Check voltage thru H1 terminal to wire 1M7B (wire number varies) thru to terminal A1 of the hydraulic motor contactor.

At the NO contract on 1M contactor
-check that wires are tight

5. Check between terminals L and N on the input side of the plc. If voltage is present and no LED’s are lit then the PLC is defective and will need to be replaced.

On Mitsubishi controlled saws, the blade shuts down after running just a few seconds.

There may be a problem with the blade speed proximity switch, which also functions as a blade breakage switch. The broken proximity switch option can be turned on / off through the parameters to enable the saw blade to remain running until the proximity switch can be replaced. Contact HYDMECH to obtain the correct password to enter the parameters.

On my inverter driven machine the blade shuts down and will not restart.

Disconnect the supply voltage to the saw for approximately five minutes. Turn the power back on and try to restart the saw blade.

If the alarm or fault code persists, check the led screen on the blade motor inverter drive for the presence of an error code, call the factory with the saw serial number, inverter model number and the error code.

Can OES PLC controllers be upgraded to the Mitsubishi controllers used today?

No, due to design changes and electrical layout, this is not feasible or cost effective.

My chip auger has stopped turning on my saw.

The chip auger may be jammed with a thin piece of metal. If you are unable to locate or remove the obstruction, you need to reverse the auger rotation. Lower the head fully down, shut off the hydraulics, and reverse the two conveyor hoses at the hydraulic manifold. Start the hydraulics, raise the head, and switch the head to the down position and the chip conveyor will run in reverse dislodging the piece of metal. Then put the hoses back as they were initially.

Consumables used in Hydmech saws (6)
What type of hydraulic oil is used on HYDMECH machines?

Texaco Rando HD46 or equivalent or machines built with Parker or Bosch Rexroth Power Packs use Shell Tellus 22 or equivalent hydraulic oil. The fill level is marked as a black line on the temperature / level gauge.

What hydraulic oil filter is used on HYDMECH saws and how often should it be changed?

HYDMECH uses commercially available filters. When calling to order filters, please refer to the information listed on your current filter to obtain the proper dimensions as different sizes are used for our machines.

Filters should be changed after the first 50 hours of operation and then every 500 working hours after that.

What type of gearbox oil is used and what amount is required?

See owners manual for gearbox number.

Renold gear boxes – Mobile SHC 632
Amount (Liters)
HM3 1.6
HM4 1.8
HM5 2.5
Lenze gearboxes – Shell Tivella WB220
Amount (Liters)
Size 8 1.8
Size 10 2.5
Size 12 5.5
David Brown gear boxes – Shell Omalla WA-150,Tivella WB-220 can be used in place of the WA-150.
Amount (Liters)
287 1.8
1002 3.6
Canimex gear boxes – Mobile SHC-632
Amount (Liters)
HM3 1.7
HM4 3.0
HM5 4.5
Bonfiglioli gear motors – MobileSHC630 synthetic oil
Amount (Liters)
A412 5 (H14A / V18 / V18APC)
A503 8.4 (H18A)
A503 11 (V25)
A603 15 (H22A / H28A / DCM)
Bonfiglioli gear motors – Shell Tivela S320 Synthetic oil
Amount (Liters)
A703 15 (H32A / H40 / H2642)
W110 1.5 (S23, S23A Series II & III)
W86 0.64 (S20, S20A Series II & III)
What type of grease is used on all fittings?

Any good quality all purpose grease can be used, but we suggest that the shuttle bushing housing are greased with LPS Therma-Plex Hi-Load bearing grease.

MSC product #70414 or Grainger product #4UJ40.

Are parts or upgrades available for older saws?

Parts are available for older saws and most HYDMECH models can be upgraded to current systems. Please contact HYDMECH or your local distributor for pricing and availability.

What are the chip conveyor hose numbers?

H-Series Machines- Hose numbers are 44 & 44T
M-Series Machines- Hose numbers are 44C & 44T

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