Cat 312B/C/D/E

As John said you can order direct from HKX.

Thought about putting aux lines our 321DL in order to run a hammer just haven't gotten around to getting a quote from them.

Spoke with HCT today and they sent me a quote. Lets call it $6000.00.

I guess I am picky, I want the pedal from Cat that matches my other machines, I have a set of relief cartridges from a 312B new in the box, (may or may not fit my 312C) from there it is 2 lines over the boom and 4 hoses, I would think I could get it done for less than 6k.

This is a pain in the neck. I am apparently not good with SIS, cannot find aux lines, they must be in a paper book somewhere. Did Cat make lines for these machines back in the day? There must be a part number for the 2 lines up over the boom?

SN:CAT0312CKCBA02928

Everyone just bought hydraulic tubing back in the day and put ends on. Tubes were bent in place. The ends could be ferrel type, swaged or welded. I don't know if the kits come with the tubes but it would be tough to try to ship them with them complete. I'm sure you can order the pedal from Cat. No one in this area uses a pedal for the aux circuits anymore. All are solenoid operated from a joy stick handle.

Search SIS for 1972249 and 2536452. Just use your serial prefix CBA.

I ordered my '03 315CLC with a thumb so it came with an auxiliary circuit. When I bought my first crusher bucket I had to buy an additional auxiliary kit that would engage 2-pump flow so that I could meet the hydraulic demands of the attachment. I had heard good things about HKX so I sourced it from them. It cost me about $8,500 and this was back in 2016 (maybe 2015?). It was not a complete auxiliary kit as much of what I needed was already on my machine (including -16 tubes to the stick). It did include parts to make the circuit select-able (albeit manually) between bi-directional and mono-directional. The -16 tubes and valves came to plumb the stick, and retain thumb capabilities (again, manually switched). It also added parts to the pilot circuit to enable the 2-pump flow when the circuit was activated. My son, and I installed the kit and I would say that the directions were pretty good. I was not overly pleased with the fact that certain parts were absent, or incorrect, and the pressure switch failed (2 times!) before they sent one stout enough to handle the circuit pressure (on the low psi pilot circuit no less). They ended up sending me what I needed but it still caused me a lot of grief (and a machine that was disabled for a long time) to work through getting everything that I needed to complete the install. I would not have rated HKX customer service very high. In the end we got what we needed and still have a lot of fittings that we don't really need. I'm not sure if I would recommend them anymore, and I may go back to them if I had to. I know that they have been around for a long time and I feel pretty confident that they should be able to take care of you in the end. All of my newer machines came equipped with attachment management software, and all the required hydraulics to run any number of attachments so I have don't have any solutions from other sources either. This is one of the issues with buying used equipment. Not only is it a struggle to find a low houred machine, it is twice as difficult when you need it equipped a certain way. In my opinion, it is always a struggle to fit those aftermarket parts onto those machines, if only due to the much greater cost to buy the new parts for a dated machine. Anyway, that was my experience with HKX.

Fueling up the machine the other day noticed the pouch behind the seat was bulging, score, full parts manual behind the seat.

Called my cat dealer with the part numbers for the auxilary lines, none available. The lines for the bucket, dipper and boom are available.

Looking at my 3 other machines in comparison, we are going to the hydraulic shop and have tubes made.

So Problem #1 solved, found a hydraulic pin grabber on Craigslist with lines and the control valve for $2500.

we actually make some of the piping kits for the Cats, the connections themselves are pretty easy to do. Let me know if you need any help have loads of pictures etc and all the clamps etc (original ones used by Cat). I can give you the following:

Original Cat type stop valves
all clamps for the piping
all the fittings and adaptors for the piping
steel piping for the aux circuit (6mm wall thickness seamless TIG welded)
Can do the hydraulic hoses as well if needed with full assembly pictures

Let me know if you need help with the assembly I have a couple of machines I can take some pictures to show you how to install it. You don't need relief valves usually as the aux circuit is fitted with them, but if you do want some we have them as well.

We've installed a few dozen aux circuit across Cart 312/B/C/D, quite straightforward installation compared to some other makes.

some more of the hardware you need