Selecting hydraulic motors and a pump for hydrostatic ...

AielloJ said:

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What might be some considerations or things to keep an eye out for when designing the circuitry?

Make friends with your local hydraulics dealer. Get a catalogue from their supplier. Use their nomogram to select hose diameters. Look at the selection of different hose couplings available. Learn to clearly identify the common coupling thread standards.

During development, if possible use the same size hoses everywhere, to reduce spare parts stock. Some hoses will be smaller such as the bleed hose from a motor, pump, or DCV.

You do not need crimped hoses at the pressures you are operating. Use Two wire hoses. Make your own with field attachable hose couplings. That way you can make changes as you proceed. Avoid ordering custom hoses that are expensive and will cost full price again every time you make a small change and throw away the last one. Keep plenty of hose on hand, with the ends covered with tape to keep it clean. Re-use the field attachable hose couplings during prototyping. Different parts will have different pipe threads or flanges. Try to make hoses that join things without needing too many adaptors or converters. Prefer male-male thread adaptors to keep cost and space down.

When a hose that goes to the steering must repeatably bend about the steering vertical axis, it needs to follow an S shaped path. It should remain in a horizontal plane. If it came down from above, then the steering would tend to kink, or twist the hose and loosen the connector. Put a bulkhead connector or a hose clamp-block near the flexing part so it remains in position. Use elbows where needed. Prefer swept elbows to sharp bends.

Return oil should be released into the reservoir below the surface so as to prevent air bubbles in the fluid. Remember to allow a large reservoir tank surface area for cooling of the oil.

Use the right filter in the right place. Have a screen in the tank to catch the bigger bits before the filter. Place a vacuum gauge where you can see it. Connect it to the pump inlet, after the filter, so you can quickly identify a blocked filter when you are at top speed.

Get a pressure gauge with a T adaptor so you can measure pressures during testing.

Make friends with your local hydraulics dealer. Get a catalogue from their supplier. Use their nomogram to select hose diameters. Look at the selection of different hose couplings available. Learn to clearly identify the common coupling thread standards.During development, if possible use the same size hoses everywhere, to reduce spare parts stock. Some hoses will be smaller such as the bleed hose from a motor, pump, or DCV.You do not need crimped hoses at the pressures you are operating. Use Two wire hoses. Make your own with field attachable hose couplings. That way you can make changes as you proceed. Avoid ordering custom hoses that are expensive and will cost full price again every time you make a small change and throw away the last one. Keep plenty of hose on hand, with the ends covered with tape to keep it clean. Re-use the field attachable hose couplings during prototyping. Different parts will have different pipe threads or flanges. Try to make hoses that join things without needing too many adaptors or converters. Prefer male-male thread adaptors to keep cost and space down.When a hose that goes to the steering must repeatably bend about the steering vertical axis, it needs to follow an S shaped path. It should remain in a horizontal plane. If it came down from above, then the steering would tend to kink, or twist the hose and loosen the connector. Put a bulkhead connector or a hose clamp-block near the flexing part so it remains in position. Use elbows where needed. Prefer swept elbows to sharp bends.Return oil should be released into the reservoir below the surface so as to prevent air bubbles in the fluid. Remember to allow a large reservoir tank surface area for cooling of the oil.Use the right filter in the right place. Have a screen in the tank to catch the bigger bits before the filter. Place a vacuum gauge where you can see it. Connect it to the pump inlet, after the filter, so you can quickly identify a blocked filter when you are at top speed.Get a pressure gauge with a T adaptor so you can measure pressures during testing.

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The reason for sharing it (again) is to ask if anyone has used the new rebuilt kits that use the "rubber" cup instead of the original leather ones. It looks to me like someone got the idea (most likely from the Garage Journal community) to create and sell a rebuilt kit which I think is a great idea but I wonder about the quality of the main u cup. If anyone has used the kit, would you mind to share? I have used a couple of kits with the leather cup from different sources and more often than not the leather cup is kind of "crumbly".

Anyways, if you have not seen the video you are in for a treat, it is a long video (over 1 hour!) and a lot of it is sandblasting (I just fast forwarded the sandblasting parts hahaha) but there is a lot of machining ( made me think of your jack


Hein Werner Floor Jack Restoration

My guess is that the video has already been shared somewhere on the multiple Hein-Werner Jack restorations posts so my apologies if you have already seen it.The reason for sharing it (again) is to ask if anyone has used the new rebuilt kits that use the "rubber" cup instead of the original leather ones. It looks to me like someone got the idea (most likely from the Garage Journal community) to create and sell a rebuilt kit which I think is a great idea but I wonder about the quality of the main u cup. If anyone has used the kit, would you mind to share? I have used a couple of kits with the leather cup from different sources and more often than not the leather cup is kind of "crumbly".Anyways, if you have not seen the video you are in for a treat, it is a long video (over 1 hour!) and a lot of it is sandblasting (I just fast forwarded the sandblasting parts hahaha) but there is a lot of machining ( made me think of your jack @paulsomlo ) and if anything else, the creating of the new tag alone at the end is worth the wait!

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