JCB 8015 arm not lifting

Moog

Moog

Member
Yes, all worked beforehand. Electrics seem ok, they work on ignition, horn, digital console display. There is a connector on the alternator with 2 yellow wires coming off it, which Ive disconnected and reconnected to check for a broken wire. Not sure where those 2 wires go to as they get lost in braiding. I will take a pic and add it here for suggestions 😀
IMG_0903.jpeg
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
I’ve tested the solenoid (coil attached) direct to 12v battery, bypassing dead man’s switch - nothing on the hand controls. Also tested coil separately when it is attached to the circuit, lifting and lowering the arm control to activate the dead man’s switch, which magnetised the coil (holding a screwdriver) when the arm control was lowered.
when dead ending the blade circuit???
 
Moog

Moog

Member
when dead ending the blade circuit???
Nope, I had all the circuit connected. I could repeat the blade dead ending with the solenoid connected straight to the battery, so bypassing the dead man switch?
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
Nope, I had all the circuit connected. I could repeat the blade dead ending with the solenoid connected straight to the battery, so bypassing the dead man switch?
IMHDO you have reached the point where you need to check the pressure on the servo circuit Stauf test point to, ensure the RV isn't dumping your pressure -- :(

according to the book of words, the servo RV setting is 17 bar

this also mentions ''filtered adaptors'' in the ''notes'' section - might have a blockage, but very odd to suddenly go AWOL unless the RV has failed (split/broken seal/O ring? )
WP_20250101_16_51_10_Pro.jpg
 
Moog

Moog

Member
Do I need a specialist hydraulic oil testing guage, or will a buy from ‘that’ auction site do? I’m going to have to put the job on hold for a few days as I need to pop north to Sunderland to see my dad. I will be back!!
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
IMHDO you have reached the point where you need to check the pressure on the servo circuit Stauf test point to, ensure the RV isn't dumping your pressure -- :(

according to the book of words, the servo RV setting is 17 bar

this also mentions ''filtered adaptors'' in the ''notes'' section - might have a blockage, but very odd to suddenly go AWOL unless the RV has failed (split/broken seal/O ring? )
the notes say three, so could reasonably assume they are the adaptors feeding the pump lines into the valve block .... there are three other lines - two, to/from the servo controls and one feeding the servo accumulator, but I'd be checking the pump line adaptors first (can't see as the accumulator'd be fitted with a filtered adaptor??)
first though - test the servo pressure at the Stauf at "PV test point" .. if it's poor/down, try adjusting up - if it's very poor - whip the RV out - it's the one thing that could have 'an instant failure' and cause total loss of servo pressure
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
Do I need a specialist hydraulic oil testing guage, or will a buy from ‘that’ auction site do? I’m going to have to put the job on hold for a few days as I need to pop north to Sunderland to see my dad. I will be back!!
as cheap as it comes ...


bit more £s


and here's a 'daddy'


and here's a couple of 40 bar gauges -- doubt a 100 bar clock will be accurate enough to set 17 bar




several years ago when I was 'in need', kits were not that as widely available like this ..
by the time I'd bought a kit, a few additional gauges and several Stauf tees, to accompany my kit, I was well over the cost of the 'daddy' above

money spent on tools is always money well spent - unless they're made of plasticine/compressed heffalump sh1t/chinesium, they will always have a value - if only to get you out the tish on a Sunday afternoon :rolleyes:;):giggle:
 
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jd6820

jd6820

Well-known member
the notes say three, so could reasonably assume they are the adaptors feeding the pump lines into the valve block .... there are three other lines - two, to/from the servo controls and one feeding the servo accumulator, but I'd be checking the pump line adaptors first (can't see as the accumulator'd be fitted with a filtered adaptor??)
first though - test the servo pressure at the Stauf at "PV test point" .. if it's poor/down, try adjusting up - if it's very poor - whip the RV out - it's the one thing that could have 'an instant failure' and cause total loss of servo pressure
Afraid, I'm not sure this test is going to help. As that is testing pressure after the solenoid... Which given there is no movement from any pilot functions would kind point to no pressure at this test point. A more valid test would be at the other test port "PT". This would indicate pump pressure is reaching the relief/regulating valve... Wouldn't require a low pressure guage either.

I suspect that solenoid isn't energised properly or the valve jammed. The hydraulics stopping since seat has been removed could be a curve ball... If the OP unscrews the cartridge that has the solenoid ontop and then operates the deadman lever. See if an audible 'click' can be heard and the valve movement seen. Easy to do and requires no test equipment. Don't run the engine with the valve removed unless you want an oily mess to tidy up. :LOL:
 
Moog

Moog

Member

Afraid, I'm not sure this test is going to help. As that is testing pressure after the solenoid... Which given there is no movement from any pilot functions would kind point to no pressure at this test point. A more valid test would be at the other test port "PT". This would indicate pump pressure is reaching the relief/regulating valve... Wouldn't require a low pressure guage either.

I suspect that solenoid isn't energised properly or the valve jammed. The hydraulics stopping since seat has been removed could be a curve ball... If the OP unscrews the cartridge that has the solenoid ontop and then operates the deadman lever. See if an audible 'click' can be heard and the valve movement seen. Easy to do and requires no test equipment. Don't run the engine with the valve removed unless you want an oily mess to tidy up. :LOL:
Just to confirm, I need to unscrew the valve from the block, then test this with coil connected (just with ignition on) the coil should energise the valve and I should see some sort of movement and audible click if it is operating correctly. I have ordered some bungs as suggested to reduce oil leakage when valve is removed. Cheers guys
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better

Just to confirm, I need to unscrew the valve from the block, then test this with coil connected (just with ignition on) the coil should energise the valve and I should see some sort of movement and audible click if it is operating correctly. I have ordered some bungs as suggested to reduce oil leakage when valve is removed. Cheers guys
yeh - do not run the engine with the cartridge removed ... will have full pressure behind it and make a hell of a mess ... ign on and operate the dead man lever to see if the shuttle is operating
 
jd6820

jd6820

Well-known member
Just to confirm, I need to unscrew the valve from the block, then test this with coil connected (just with ignition on) the coil should energise the valve and I should see some sort of movement and audible click if it is operating correctly. I have ordered some bungs as suggested to reduce oil leakage when valve is removed. Cheers guys
Yes exactly that.
 
Gunners

Gunners

Well-known member
Guys, maybe this is ridiculously obvious but these machines have two deadman leavers right? But not this machine as it has a cab. That doesn't mean the switch isn't still there under the plastics. No chance this hasn't been accidently moved has it?
Or have I missed something and all the other arm functions are working just not boom up?
 
Vinpetrol

Vinpetrol

Well-known member
Guys, maybe this is ridiculously obvious but these machines have two deadman leavers right? But not this machine as it has a cab. That doesn't mean the switch isn't still there under the plastics. No chance this hasn't been accidently moved has it?
Or have I missed something and all the other arm functions are working just not boom up?
I’ve been caught out a few times overlooking the obvious and digging into the guts of a machine
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
Guys, maybe this is ridiculously obvious but these machines have two deadman leavers right? But not this machine as it has a cab. That doesn't mean the switch isn't still there under the plastics. No chance this hasn't been accidently moved has it?
Or have I missed something and all the other arm functions are working just not boom up?
I did mention the right hand side dead man a while back Ollie, but as you say, this has a full cab so 'shouldn't' be there (y)
 
Gunners

Gunners

Well-known member
I did mention the right hand side dead man a while back Ollie, but as you say, this has a full cab so 'shouldn't' be there (y)
I was thinking the arm might not be but the switch could well be under the plastic cover. Be an easy fix if it is... Worth checking?
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
I was thinking the arm might not be but the switch could well be under the plastic cover. Be an easy fix if it is... Worth checking?
can't see as it would be though as doesn't have an arm to operate it/keep it closed :unsure: ....... but anything's possible with a Jake :rolleyes: ....... however, the solenoid is operating according to Moog o_O .. so either a stuck/non operating cartridge or lack of oil pressure are most likely ATM
 
Moog

Moog

Member
my trip up to gods country 😀 has been cancelled due to weather, so going to try and crack on with more testing tomorrow/Sat - still appreciate all yer thoughts and comments above - we will get this bad boy going eventually!
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
There could be a piece if crap in the cartridge of the solenoid valve
been there with my load sensing circuit on the 'Drema .... took some bloody finding too -- tiny rubber crumb from the inside of a hose :mad:
 
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