Hi all,
Like a few others who found their way here, I scavenged a V2203 DI from a reefer and am attempting to install it in a Komatsu PC40-3 excavator. The original Yanmar 3D94 engine it came with is unobtainable at any price, as I understand it.
I've worked out most of the install hassles, and have a good running blue/green motor sitting on the floor of the shop, ready to drop in.
Problem is, and I didn't realize this as I bought the excavator without an engine AT ALL (and didn't really research it), the original Yanmar engine ran 2 separate hydraulic pumps, feeding a total of 3 independent hydraulic circuits. I guess Komatsu doesn't believe in power beyond spool valves. . . . but I digress.
The big pump that runs off the flywheel is a tandem producing 12gpm for each stage. A smaller pump that ran off an accessory drive on the front of the original Yanmar engine produces 8gpm, both flow ratings at 2250rpm.
I bought an SAE4 pump mount plate and flywheel coupler from Hayes couplings that mounted the big pump no problem.
Having read the challenges involved in getting a tractor hydraulic pump to run on a reefer motor, I'm seeking alternatives to the second pump.
I could possibly source a tractor pump that runs off the back of the injector pump, but there's a lift pump there that is useful and I'd rather not remove it, and things are kinda crowded there already. I made a bracket for the fuel/bypass oil filter that occupies most of that space and I don't think I could squeeze in a hydraulic pump easily.
I'm new to all this hydraulic stuff, but I'd like to think I'm a quick study. Spoke to an equipment maintenance person last week who swore Kubota made some hydraulic pumps that ran off the splined section of the crankshaft on the FRONT of the motor, and even had a drop down gearbox to clear the radiator. I've seen mention on this forum of universal joint-and-shaft driven pumps that run off this location, but I have no idea what tractors use them, or if they'd even work for my application.
In absence of a good solution to a 2nd pump, I'm talking to a few different hydraulic pump shops about having a 3 stage pump assembled that runs entirely off the flywheel. Material and labor shortages are making that option appear to be a difficult one. . . plus I'm hearing I may have to change my flywheel coupler to a different size or spline as most pumps with outputs in that range do not run off the 7/8" 13 spline pattern the komatsu pump uses.
I'd love to find a tractor pump I could use. . . I already have a new tandem pump to go on this motor, but there is no way I can see to make this machine run off 2 circuits without major re-plumbing. . . plus I like building things in a manner that is serviceable.
The 2nd pump runs the blade and boom swing, both of which are just cylinders. . . but it also combines the output of the 2nd pump with the 1st when "high speed travel" mode is engaged (little foot pedal, makes it move slightly faster. . .2.8mph vs 2.1mph). It also provides the best source for hydraulic power for accessories, like a thumb or breaker if I decide to add that later. . . so I don't feel like I can do without it.
So, what are some options for spinning a pump off this motor?
Like a few others who found their way here, I scavenged a V2203 DI from a reefer and am attempting to install it in a Komatsu PC40-3 excavator. The original Yanmar 3D94 engine it came with is unobtainable at any price, as I understand it.
I've worked out most of the install hassles, and have a good running blue/green motor sitting on the floor of the shop, ready to drop in.
Problem is, and I didn't realize this as I bought the excavator without an engine AT ALL (and didn't really research it), the original Yanmar engine ran 2 separate hydraulic pumps, feeding a total of 3 independent hydraulic circuits. I guess Komatsu doesn't believe in power beyond spool valves. . . . but I digress.
The big pump that runs off the flywheel is a tandem producing 12gpm for each stage. A smaller pump that ran off an accessory drive on the front of the original Yanmar engine produces 8gpm, both flow ratings at 2250rpm.
I bought an SAE4 pump mount plate and flywheel coupler from Hayes couplings that mounted the big pump no problem.
Having read the challenges involved in getting a tractor hydraulic pump to run on a reefer motor, I'm seeking alternatives to the second pump.
I could possibly source a tractor pump that runs off the back of the injector pump, but there's a lift pump there that is useful and I'd rather not remove it, and things are kinda crowded there already. I made a bracket for the fuel/bypass oil filter that occupies most of that space and I don't think I could squeeze in a hydraulic pump easily.
I'm new to all this hydraulic stuff, but I'd like to think I'm a quick study. Spoke to an equipment maintenance person last week who swore Kubota made some hydraulic pumps that ran off the splined section of the crankshaft on the FRONT of the motor, and even had a drop down gearbox to clear the radiator. I've seen mention on this forum of universal joint-and-shaft driven pumps that run off this location, but I have no idea what tractors use them, or if they'd even work for my application.
In absence of a good solution to a 2nd pump, I'm talking to a few different hydraulic pump shops about having a 3 stage pump assembled that runs entirely off the flywheel. Material and labor shortages are making that option appear to be a difficult one. . . plus I'm hearing I may have to change my flywheel coupler to a different size or spline as most pumps with outputs in that range do not run off the 7/8" 13 spline pattern the komatsu pump uses.
I'd love to find a tractor pump I could use. . . I already have a new tandem pump to go on this motor, but there is no way I can see to make this machine run off 2 circuits without major re-plumbing. . . plus I like building things in a manner that is serviceable.
The 2nd pump runs the blade and boom swing, both of which are just cylinders. . . but it also combines the output of the 2nd pump with the 1st when "high speed travel" mode is engaged (little foot pedal, makes it move slightly faster. . .2.8mph vs 2.1mph). It also provides the best source for hydraulic power for accessories, like a thumb or breaker if I decide to add that later. . . so I don't feel like I can do without it.
So, what are some options for spinning a pump off this motor?
