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 | gbuddsr
Join Date: May 2004 Posts: 2 Upstate New York 
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2004-05-17 86220
I have a Yanmar Ym 1602D with Koyker 80 loader. I just got it and have purchased the manuals but haven't recieved them yet. I found one of the mounting bolts broken so I removed the loader for access. All was working fine before removal. I did get the bolt out but when I put the loader in position for re-attachment (using Koyker manual) I don't have any hyro to loader or 3pt. Randy at Koyker said I may not have had the hydro connectors seated all the way and sheared a key in the pump. Well that scared me to death for sure. Can anyone help with some info of where to go from here. I've been reading the posts here day and night but never thought I'd be posting myself. Thank you in advance for any help.
Gary
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada 
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2004-05-17 86221
Gary, the comment about the connectors not being properly seated I'd go along with.
I'm not sure I understand how an improperly connected hydraulic line could cause the key on the pump to shear though.
Check all the lines, I'm sure that you will find the culprit there.
Best of luck. ....
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| gbuddsr
Join Date: May 2004 Posts: 2 Upstate New York
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2004-05-17 86223
Is there a way to check to see if it is indeed working, the pump that is. Thank you for the reply
Gary ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2004-05-18 86272
A disconnected loader cylinder line shouldn't cause that sort of problem with most loader valve assemblies because a relief valve would still be in the system. I would check to ensure that all loader valves are centered though. On most systems, there is no flow to the 3ph when any loader valve is closed and the loader also wouldn't move if cylinder lines to the lift and bucket weren't connected.
Connecting the valve inlet and return lines could cause a problem. If they were disconnected you should ensure they are connected to the right ports. The inlet and return ports on most loader valves are on the ends and cylinder work ports are in the middle. Many valves have two return lines and that is the return side.
I don't think these tractors have hydraulic manifold blocks with relief and diverter valves. You should identify the high-pressure line from the pump. It should go to the valve inlet. The inlet port should be stamped IN or P on the valve body. There could be a problem if they were connected backwards. These lines ordinarily are connected with threaded fittings and it'd be unusual if quick connect fittings were used but a problem could happen if a quick-connect on the high-pressure line wasn't seated and there wasn't a relief valve ahead of it.
One way to see if the pump is working is to disconnect the high-pressure line, run it into a bucket and start the tractor. However, oil in the bucket doesn't guarantee the pump works under a load. A pressure test would be proof positive but to run one a relief valve has to be in the system. ....
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