Cycle Start Issue on Universal 3

A new gremlin has reared its head with my Universal 3, I’m having trouble with the cycle start button. Sometimes when the button is pushed nothing happens, if I hold it down it seems to eventually start the cycle and the time I need to hold it down varies from a second or two to what seems like forever. I dont believe its a short in the button itself because if I switch it to manual mode there is no movement using the toggle switch. Any help would be greatly appreciated. Thanks

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Paul Moxon, Moderator
8 years ago

AJ, I thought the same thing when I saw Dan’s list. I’m setting up an excel file to make a searchable table. Please let me know what other parts you want to see added to the list.

Paul Moxon, Moderator
8 years ago

Basil Head, a seasoned press mechanic in the UK writes:

Time has slipped by since you posted your problem with the Cycle button and by now you may well
have solved the fault. But as I have not seen any further comments assume it is still ongoing. I
watched your video of the carriage movement and feel the relays are functioning correctly once the
carriage is moving. Which makes me feel there is a problem with the Limit Switches at the back of
the Press.

The four Limit Switches play an important part in the circuitry, controlling the relays and the half
speed control at the beginning and end of each cycle. Over the years I have found these switches
become saturated with oil for some reason and this impedes the action. All four LS switches are
fitted open circuit and when the cam fitted to the Carriage depresses the lever and the Press
electrics are on, the relay coils are activated. So when the carriage is at the feed board LS1 & LS3 will change to closed circuit position. But the circuit is incomplete until you either use the toggle switch Forward/Reverse or use the Cycle Button. I would suggest removing the switch covers off and
checking each one. The Switches are manufactured by Honeywell Part no. BZ—2RQ1M—A2. Just a

The Arm
8 years ago

These are some of my parts number notes for the Uni III. I would love it if people would comment and add to this. I have done well using these parts numbers to find new old stock spares on eBay and surplus sites.

ALLEN BRADLEY 800T T2MB21 – main forward, stop, reverse lever assembly

OHMITE VT 8X VARIAC – not the same as VT-8


OHMITE L50J200K – make sure it is the correct length

OHMITE L25J500 500 OHMS 25 W RESISTOR – make sure it is the correct length


12MA7 BUTTON – main green button on press




GENERAL RADIO KNSP-6 BLACK (sourced from Leeds Radio)

GENERAL RADIO KNSP-8 BLACK (sourced from Leeds Radio)




B2A BULB (run bulb on SP, Universal presses)


The Arm
8 years ago

I recently had a similar problem and blamed the relay so I swapped it out with an NOS one found on eBay. The part number is OHMITE DOSX-7T 15A 115V AC. When I went to change it I found that one of the connections had popped a solder joint and the old unit was probably fine.

The main speed control rheostat/variac has more often caused me problems. I have found that by slightly changing the speed it sometimes makes contact and happily chugs back into action. Noting this, I found that a light pull on the speed control knob made the press behave happily. There must be some wear in the contacts that was causing poor conductivity. My mildly ridiculous fix for this was to take off the knob, stack a couple of washers behind it on the shaft, and re-tighten the knob while pressing outward from the inner face of the rheostat. This kept a little bit of outward pressure on it and has brought the variac back to life.

I have also recently had to replace the main ‘forward’ RBM contactor relay. The connections were all good, and the points are fresh, but the magnetic paddle assembly on the back had popped free and was weirdly half-working. I was lucky to have a spare in my parts stash.

Have you changed the resistors yet? Most of the parts in there can still be bought if you cross reference the part numbers.


John Henry
8 years ago

I don’t hear any relay “chatter” in the background of your video, but that would be one thing to check, maybe a relay is not making good contact right away. You might open the back door and see if you see anything interesting going on there as the button is pushed.

I did check on my Universal III, and tried using the cycle mode with varying time delays, and found that the setting of the time delay rheostat did have some effect on the timing of the start of the cycle. I had thought the delay only came into play when using the press in “run” mode, but there was a substantial delay before the forward relay engaged after the “cycle” button was pushed when the delay rheostat was set to maximum, and less of a delay when the rheostat was set to minimum delay. If you look at the schematic diagram in the manual, you can see that the circuit does go through the time delay relay, and assumes it to be in closed position.

If, however, the delay varies without moving the rheostat position, there may be some problems with the delay rheostat (might need cleaning) or the delay circuitry. Make certain all the terminal screws are tight on the “time delay board”.

Try various settings and see if there is a change in the response time of after pushing the “cycle” button.

Please report back your findings so we can add to our troubleshooting files.

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