Im working on a 160m2 as the title says and am fixing some leaks coming from the front and middle control valves. In the parts book and on SIS (as far as I can find-pretty new to it) the "oring kits" I have found are: 248-6887 (3 orings and 2 backup rings) 471-4231 (3 orings and a backup ring) The main problem im running into is the control valves that specify to use 471.. have 3 orings and 2 backup rings, same as the others that use 248.. in measuring the o rings I found that only the largest really differs. The parts book and SIS dont specify what orings makeup the "oring kit" so if anybody has knowledge or experience with this please help haha
I forgot to mention the "oring kits" only cover the check valves. Luckily that is where im leaking from so ive been able to do the ones that specify to use 471.. but now 248 doesnt have enough orings to cover the other valves.
You need to a one level up in the Parts Manual, it's called a Valve Gp - Bank. It covers all the seals, etc, that are in between the various valve sections. AFAIK there is no single "seal kit" that covers either the whole of a single section of the control valve or the complete valve assembly. You just have to go through the parts manual and order all the seals separately. For example if you have a leak on a solenoid valve in one valve section you'll need to drill down to the solenoid valve itself to find the Part Numbers of the seals.
CAN SOMEONE HELP ME WITH THE MAINTENANCE MANUAL FOR THE CATARPILLAR 303.5 E RC MINI EXCAVATOR? THE ARM OF THE MINI EXCAVATOR FALLS ONLY WHEN THE EQUIPMENT IS OFF, BUT THE CYLINDERS ARE NOT WET. THANKS, I'LL BE CAREFUL
Thank you, I have done more rooting around on SIS and found i06222481 (improved external oring) which helps me understand the leaks better. What im still trying to figure out is the specific oring P/N's on the check/relief valves themselves. Looking into the "kit" SIS doesnt even show that the kit comes with the PTFE backup rings which is strange. And in all the parts breakdowns ive been able to find they dont point out the orings on the check/relief valves themselves. They are the only ones that arent specified. Can you help me in finding the specs for the PTFE backup rings please
That's only an illustration number. Where exactly did you find it.? A Service Magazine or somesuch.? A question for you. The Hydraulic Arrangement of your particular Serial Number is listed as per the attachment. Please can you confirm that this is EXACTLY how the machine is equipped before we move forward, especially as to how many sections are in each valve bank on the machine.
OK, got it. Service Mag SEPD2024. The update mentioned in the SMag applies to your Serial Number. The important thing to remember is that NONE of the Part Numbers for the Check Valves, etc, change. So armed with the Part Number of a specific cartridge from the valve section, first of all you have to go looking at the end of the cartridge on the machine to find the Engineering Change (CHG) Number that is marked on it. If what is on the machine is the latest CHG Number (refer to the text of SEPD2024 for details) then you can reseal it using a 471-4231 Seal Kit. If what is on the machine is an older (lower in other words) CHG Number then the complete Check Valve Gp, Plug As, or Check & Relief Valve Gp, as appropriate, must be replaced with a new one. A reseal with the former 248-6887 Seal Kit will not fix the leak.
Yes its a service magazine- im not sure what to put in here to show which one it is. It also has smcs-5051 and "improved check valves are now used on certain motor graders" is the title. Ok in not understanding the attachment. I understand you want me to check the control valve banks-do you want me to verify what attachments are in those banks and how they are ordered?
To reply to that last paragraph- Heck ya! That clears up a bunch of confusion. I went through yesterday and measured the orings and can confirm 248.. doesnt have the "updated" large sealing oring. Ill go through and check the check valves and check/relief valves today.
For future reference the document reference number SEPD2024 is located on the extreme RH side of the title line.
From the LH column of Serial Numbers in the SMag you know that your machine (S/N below 410) was not fitted with the latest parts when it was originally built. Therefore you should look at each valve section in turn, locate the Part Number and (most important) the CHG Number. Hint: I would say that any check valve that still has yellow paint on it is likely to be original.
I appreciate the help Nige- cleared it up pretty well for me. Lastly do you know if cat makes a "backup ring" kit?
Cat are very poor on kits. I don't know of one.
Thing is with kits that a single Part Number of kit might only be applicable to maybe a dozen models of machine. In contrast, a single Part Number of O-Ring or of a backup ring might be used on literally thousands of different models. So what would you rather do, go to the dealer parts counter asking for a long list of indicidual seals/backup rings and find they are all in stock, or go asking for a single Part Number of kit to find that the nearest one is thousands of miles away or worse, on back order.?
Yea for the most part I get that but on the other hand Im working for a municipality in a smaller town not on any road system and with no dealer I can drive to. Getting parts takes anywhere from 5 days to a month so ive been trying to get as many "consumables" as possible to try and increase efficiency. I appreciate the insight.
Having once worked on a mine site that was referred to as being "At the end of the longest cul-de-sac in Africa" (1200km) I can sympathize but in those circumstances it behoves you to do all your due diligence and make sure your parts lists are 110% right before you go ordering them.
Thats a different type of work! Cool to hear about for sure. Roger that, ive gotten almost all the service/parts manuals for all our equipment and make sure to put in all the parts orders myself so nothing gets left out doing good and learning lots!