foxy99
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Posts: 1,424
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Sept 17, 2023 16:35:28 GMT
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So I have had this for years but it was always too big to get into my car to take to the workshop proper and work on it. Many years ago I jacked a friend's car with it and it wouldn't stay up so I'm thinking one of more seals need replaced. It seems to me there is a large hydraulic side (the ram?) and a small one (the pump?) Looks to me it's mb the pump that needs sorted on mine So where do you start? I guess you take off the sides of the whole frame then treat each hydraulic section separately  big old jack  ram?  pump? |
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1974 Daimler Double-Six VDP
1965/67 Hillman Imp pick-up
1984 VW Polo breadvan
1970s Yamaha Twins (4)
1976 Honda SS50ZK1
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Sept 17, 2023 20:34:52 GMT
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The seals will be on the ends of each piston rod, pull it appart undo the gland nuts and it will probably pull out, you can get new ones on ebay. The piston rod looks pretty rusty the seal that runs on that is usually a o ring which acts as a dust and dirt seal so you should be able to get away with cleaning up the rod. There will also be a couple of ball bearings somewhere which act as non return valves and the lowering valve is usally a tapered end of a threaded shaft into a hole.
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foxy99
Posted a lot
Posts: 1,424
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Sept 18, 2023 8:17:13 GMT
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Thanks for that kevinsDo you know if the sides of the jack need to be taken off to get to the gland-nuts etc? |
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1974 Daimler Double-Six VDP
1965/67 Hillman Imp pick-up
1984 VW Polo breadvan
1970s Yamaha Twins (4)
1976 Honda SS50ZK1
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Sept 18, 2023 8:29:58 GMT
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why not just pull it apart and treat it to a some paint all over
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foxy99
Posted a lot
Posts: 1,424
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Sept 18, 2023 8:57:05 GMT
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I will be repainting it but want to make sure it's working first It's too big for man-cave art. Needs to be functional NB it's going to be in Violet Hammerite (discontinued colour)  |
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1974 Daimler Double-Six VDP
1965/67 Hillman Imp pick-up
1984 VW Polo breadvan
1970s Yamaha Twins (4)
1976 Honda SS50ZK1
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Sept 18, 2023 12:00:20 GMT
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They do differ but yes it looks like you have to remove the valve / piston bodies from the side plates first.
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Last Edit: Sept 18, 2023 12:01:23 GMT by kevins
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93fxdl
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Posts: 2,010
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Sept 19, 2023 7:30:04 GMT
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First step should be cleaning it, hydraulics and dirt don't play well together.
Check oil condition and level,
Then test to see where the fault is,
Since it lifts ok, the pump must be working
To creep down under load, the most likely culprits will be the one way valve or the lowering valve, the other alternative is the seal on the lifting ram
Make sure the lowering valve is fully closing
Try to force ang dirt out ove the vaves, by taking it to maximum, then pump some more to open the presure relif valve.
Next place a load on it and let it down rapidly to flush the lowering valve
If it still creeps under load, then is the time to start pulling it apart
Ttfn Glenn
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Sept 19, 2023 8:49:07 GMT
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I have an almost identical Epco jack cluttering up my garage, so will be following with interest! Keep us informed of developments!  |
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Old Fords never die they just go sideways
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foxy99
Posted a lot
Posts: 1,424
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Sept 19, 2023 10:18:46 GMT
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First step should be cleaning it, hydraulics and dirt don't play well together. Check oil condition and level, Then test to see where the fault is, Since it lifts ok, the pump must be working To creep down under load, the most likely culprits will be the one way valve or the lowering valve, the other alternative is the seal on the lifting ram Make sure the lowering valve is fully closing Try to force ang dirt out ove the vaves, by taking it to maximum, then pump some more to open the presure relif valve. Next place a load on it and let it down rapidly to flush the lowering valve If it still creeps under load, then is the time to start pulling it apart Ttfn Glenn Sounds like sound advice 93fxdlThanks |
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1974 Daimler Double-Six VDP
1965/67 Hillman Imp pick-up
1984 VW Polo breadvan
1970s Yamaha Twins (4)
1976 Honda SS50ZK1
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Sept 19, 2023 12:06:31 GMT
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Personally I'd just clean it, I love the patina!
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foxy99
Posted a lot
Posts: 1,424
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Sept 28, 2023 0:01:47 GMT
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Hi guys. Just to say I forgot I started a thread on this years ago (with almost identical title!) and will be continuing the updates on the original thread |
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Last Edit: Sept 28, 2023 0:02:57 GMT by foxy99
1974 Daimler Double-Six VDP
1965/67 Hillman Imp pick-up
1984 VW Polo breadvan
1970s Yamaha Twins (4)
1976 Honda SS50ZK1
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