Leaky levers?

R

Russell

Active member
3 of the 4 control levers/valves on my dumper are leaking where the lever goes in to the valve body. Can these be disassembled and o rings replaced or should I buy new valves?
 
Mogman

Mogman

What man as done, man can do, what never has,maybe
3 of the 4 control levers/valves on my dumper are leaking where the lever goes in to the valve body. Can these be disassembled and o rings replaced or should I buy new valves?
Simple answer is yes 👍 just pull the spools out and there are o rings inside👌 Bit of a job but simple enough
 
R

Russell

Active member
Had a go today, I've only pulled one of the valves apart so far and the shaft bit is worn. Is there anyone that reconditions them?
IMG_20200410_153052.jpg
IMG_20200410_171029.jpg
IMG_20200410_173250.jpg
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
.........the shaft bit is worn. Is there anyone that reconditions them?
If it was me I’d float a bit of brass on them then turn back down on a lathe (done it before now) a good machine shop should be able to help you out👍👍
clean 'em with some carb cleaner to get 'em spotless and try some Devcon/Belzona/JB Weld/Araldite plastic metal and reshape them carefully (lathe ideal, but I'm sure you could get them pretty fair by hand with some time) ... Mog's solution'd be best by far, but the plastic metals are machine-able and have achieved some amazing repairs with them over the years .... and I mean amazing :oops:
 
R

Russell

Active member
I've tried JB weld on the spools and it seams to have stopped the leaking after a short test (y). The levers for lifting and tipping are a bit stiff so I'll see if they bed in. Strangely there is a capped off fitting on the middle aluminium block of the valve chest (not sure if that is the right term) that is now leaking. I'll give that a tweak when I next have a go. The one in the middle of this pic.
IMG_20200410_171029.jpg
 
R

Russell

Active member
I removed the leaking cap in the picture and is got a ball and spring inside. Behind that there is like a needle valve so I assume it's some sort of pressure release valve? Inside the cap there is a hole but outside there is a blob of weld so I don't know if it should be like that if someone has dodged it after a previous leak. Does anyone know what the thing in the picture is called? It's got one fat hydraulic pipe coming out and this pressure release valve .
Any idea what could happen with the valve bunged up?
I changed the o rings and stuck it back together so I can do a job next week. After a short test it's not leaking but I would like to fix it properly.
 

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V8Druid

V8Druid

do it as well as you can,but learn to do it better
I removed the leaking cap in the picture and is got a ball and spring inside. Behind that there is like a needle valve so I assume it's some sort of pressure release valve? Inside the cap there is a hole but outside there is a blob of weld so I don't know if it should be like that if someone has dodged it after a previous leak. Does anyone know what the thing in the picture is called? It's got one fat hydraulic pipe coming out and this pressure release valve .
Any idea what could happen with the valve bunged up?
I changed the o rings and stuck it back together so I can do a job next week. After a short test it's not leaking but I would like to fix it properly.
how big a hole .. big enough to be tapped for a long hex socket screw ? ... like you might find in an adjustable relief valve

 
R

Russell

Active member
About 1 mm. It is very similar to the relief valve on your diagram. Could it be something to do with the two speed tracking?
Sorry for all the questions, I'm trying to get a bit of an understanding or hydraulics.(y)
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
About 1 mm. It is very similar to the relief valve on your diagram. Could it be something to do with the two speed tracking?
Sorry for all the questions, I'm trying to get a bit of an understanding or hydraulics.(y)
That's not the best example really .. looks like a balanced flow carttridge type, not a straight forward RV, but was the best sectional I could find, illustrating the grub and lock nut ... they're one bloody complex unit, in comparison to a simple spring, ball and seat.
the one mil hole would suggest it should be sealed within the unit and not allow any oil to bypass any seals within it .. purely a breather/vent and the fact it's been blocked would suggest a seal issue within it :unsure:
 
R

Russell

Active member
Ok thanks. I have replaced the o rings that are the same as on your picture so hopefully that will cure it. The ones I removed were hard and one broke easily.
 
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