If connected wrongly,there will cause following problems.

1.Oil pipes wrongly or oppositely connected with the cabin pump,the cabin cylinder will only go up,but can not go down.

Solution:Connect the oil pipes correctly to the connectors,not oppositely.

2.If the cabin cylinder(With lost motion) are connected with 1*1 cabin pump(Control Valve:4ways/2Pos Conventional),the cabin cylinder will not go up.

Solution:change the cabin pump to 2*1 cabin pump(Control Valve:4ways/2Pos Regenerative)