Windylk4
New Member
I have a 1989 740 Champion Grader. When I try to use the hydraulics I need to pull 2 levers at the same time to get any response. Any ideas what I need to look for?
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1989 740 Champion Grader with wing
- Thread starter Windylk4
- Start date
Fatgraderman
Senior Member
Is that with all the hydraulics? Is that just the wing? Is that the main grader hydraulics? Is that happening just with one or two functions? That one should be open center hydraulics with the pump drove off the bellhousing. A couple hoses mixed up can do that (if it's just happening with say 2 functions). Is there any hydraulic force there? I wonder if the relief has given up?
BDFT
Senior Member
You need to put a gauge on the main pump. Check main pressure and check the case drain. Main relief might be the problem. I seems to me that you don't have enough pressure. Each lever operates a separate spool for each hydraulic circuit so I can't see how pulling two would help. Maybe give Jade Equipment in Edmonton a call. They still part out these old machines.
Windylk4
New Member
It happens with all hydraulics.
Windylk4
New Member
1989 740 Champion Grader
Thank You. We are checking pressure. It has to be something simple.
Thank You. We are checking pressure. It has to be something simple.
Fatgraderman
Senior Member
It's not crossed hoses then. Has it happened since you put the wing on?