Service and Repair Manual
November 2016
Manifolds
50
GS-2669 DC • GS-3369 DC • GS-4069 DC
Part No. 1272220GT
How to Adjust the System Relief
Valve – Models with Proportional
Relief
Note: Perform this procedure with the machine in
the stowed position and in high torque mode.
1
Connect a 0 to 5000 psi / 0 to 350 bar
pressure gauge to test port #1 (TP1) on the
function manifold.
2
Remove the platform controls from the
platform and place the controls near the
function manifold on the hydraulic tank side of
the machine.
3
Remove the coil from the platform up valve.
Do not disconnect the harness from the coil.
4
Turn the key switch to platform control and pull
out the red Emergency Stop button to the on
position at both the ground and platform
controls.
5
Press and hold the enable and platform up
buttons OR select the platform function button
and activate platform up. Note the pressure
reading on the pressure gauge. Refer to
Specifications,
Hydraulic Components
Specifications
.
Result: If the pressure reading is not within
range, replace the valve.
1 test port #1
2 proportional relief valve
3 platform up valve
