Need help with 843 boom lift linkage

[rodbuilder]

Here's the deal: I bought an decent 843 that the guy just put a new hydraulic pump on, knowing that the boom wasn't lifting. When I bought it it would raise and empty bucket, but when we put a set of forks IN the bucket it wouldn't go up. The bucket tilt system is OK. So I immediately had new Bobcat seal kits put in the boom cylinders, along with new oil and a new filter. Now the boom lift is, at best "intermittent", but it's still unusable as a skid loader. I have a buyer for the machine AS-IS if I can assure him what's wrong with it. So if you're an Ace Bobcat man please tell me what might be wrong with it? We've disabled the safety lap bar and played with the pedal linkage as much as we can, even worked the pedal by hand to make it move as far as it can, but still no luck. All I can say is that there seems to be a "sweet" spot in it where it wants to move the boom but it's still not working right. I would also appreciate a link to where I can see a repair manual for this machine - an 843 Bobcat with the Isuzu engine in it. If anyone can help me on this tonight PLEASE - call me at 815-9seven3-8one28. Phil in Illinois

 

[Tazza]

I had a similar issue with a mates machine. drive worked great but had no lift power. Turned out he put a hose on wrong.
Put a 3,000 PSI gauge on the aux hydraulic coupler and activate it, see what the pressure is.
Does it have a double gear pump?