I recently acquired a MM30SR which was in reasonable order but given that it’s about 20 years old it had a few issues. The machine was made in Japan for the Asian market but is now located in the UK. This machine is classed as a grey import so getting spares could be difficult.

Thankfully the engine is a Mitsubishi S3L and these have been used in plenty of other types of machines imported into Europe so the spares for the engine seem to be readily available.

The machine came with a User Manual (in Japanese of course) which gives some information regarding maintenance but is very general.

I joined the Heavy Equipment Forum to try and find manuals for the machine but no luck so far, and of course they will be in Japanese. There seemed to be people asking the same question back in 2010 and but not much came of it.

Anyway one of the aims of this site is to try and bring together information and knowledge about the MM30.

So scrolle down to find out more on maintaining the MM30SR.

Monitor Panel & Wiring Diagram

When I got the MM30, one of the issues with it was the glow plugs. I got the impression from the previous owner that the machine was a non-runner when he got it. He spent a bit of time and money getting it going again, replacing the starter and alternator as well the ignition switch. However, the glow plugs had been wired directly from the ignition switch. I guess this was done just to get the machine going again. Also, the monitor panel was not working so no engine temperature, oil pressure or indeed glow plug light.

Inside the Monitor Panel

I put a new fuse (fuse 8, monitor panel 10A) in the fuse box under the seat but it just blew, so there was a short somewhere. I took the top off the monitor panel (should be 4 bolts but only 2 left on mine). I had a good look inside looking for loose wires and bad connections but nothing obvious to see so I thought I might as well record all the wiring details and drew a wiring diagram. To cut a long story short, the cause of the fuse blowing was a short on the external lights somewhere, so I disconnected them in the panel and got the panel to work again. I’ve posted the wiring diagram I drew up below and this might be of use to someone.