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(Without lost motion) are put with 2*1 cabin pump(Control Valve:4ways/2Pos Regenerative),it will cause the cabin cylinder go up very slowly,system pressure too high and cylinder will not go up.                   

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