kevin bordwell
New Member
kevinhicks64@hotmail.com guess the email address would help
Hi from NZ Any chance of a schematic for mitsi and location of the computer earth that needs repairNo parts needed so far, joysticks stopped working but soldered a new ground on computer and all is well.
Does anyone know where you can get parts for an MM55SR? Cat is no help and have not been able to find any parts. I'd love to have any service info anyone has. I have a schematic for the MM55SR if anyone needs it.
did you find wiring diagrams i am also looking for them as well as hydraulic valve flow diagramsGGGraham, I am in need of schematics and error codes if you still have avail. Have electrical short on many engine wires. Need to replace and troubleshoot. Thanks in advance.....Randy
Yes, I have found diagrams thanks to the folks on this forumn. Email me daddyrrat@yahoo.com and I can forward to you...Randydid you find wiring diagrams i am also looking for them as well as hydraulic valve flow diagrams
i have same problem with my mm5sr it would be great if someone can send be the schematics!Does anyone know where you can get parts for an MM55SR? Cat is no help and have not been able to find any parts. I'd love to have any service info anyone has. I have a schematic for the MM55SR if anyone needs it.
hi i would like to have the schematics if possible!Wayne I'd be interested in the code sheets if you can send them. I have schematics if you'd like them.
Yes I tried that at the very start of the diagnosis of this fault a way back when along with a number of other things. In the end I found a number of odd things and decided to replace the controller and take them out if the equation. The old controller is now disconnected so it has no part to play any more. The new IMD controller is installed and working well. But unfortunately I still have a boom that won't go down. I'm need information about the physical working of the main control valve block particularly how the electromagnet coils make the main valves operate and, more importantly, what would cause them to fail. Chéers.
Yes Graham I checked that and it is the correct resistance of 9 ohms. I have found the fault though. The coils sit on what in known as the solenoid valve, you can see them in the attached picture. I carefully dismantled and cleaned the inner workings of the valve in case it had become blocked with some dirt in the oil. The two posts you can see are the boom up and down valves actors. Inside those posts are a pin that is forced down to activate the valve when power flows through the coil. I tested them both when dismantled to find the down valve actor post does not work. The pin does not move when power is applied. Swapping the posts around and reassembling confirmed this. I now have no up boom action but down boom worksHave you checked the boom spool valve coil resistances and if there is voltage going to them when you operate the boom? Graham.
Hi Pete, I'd be very interested to know how you get on with fixing this. I have a parts manuals for the MM50SR if you are interested. Your valve part seems to be part number PA4342. GrahamYes Graham I checked that and it is the correct resistance of 9 ohms. I have found the fault though. The coils sit on what in known as the solenoid valve, you can see them in the attached picture. I carefully dismantled and cleaned the inner workings of the valve in case it had become blocked with some dirt in the oil. The two posts you can see are the boom up and down valves actors. Inside those posts are a pin that is forced down to activate the valve when power flows through the coil. I tested them both when dismantled to find the down valve actor post does not work. The pin does not move when power is applied. Swapping the posts around and reassembling confirmed this. I now have no up boom action but down boom works View attachment 244471
I am interested. Please e-mail me at davidewalsh@hotmail.com. ThanksI FINALLY (after about 5 years) have a ENGLISH service MANUAL and parts book. I also had a Japanese friend translate some of the marking on the machine (control buttons on the LCD AND the fuse panel).
If anyone is interested in purchasing (I spent countless hours and lots of money having this translated) you can email aksobe@gmail.com. Email me for a phone number as well if you like and we can chat. I would also be willing to trade for some other mm55sr knowledge OR some other help with it, or parts.