Valve Adjustments - Function Manifold - Genie GS-3390 Service Manual

Section 4 • Repair Procedures
MANIFOLDS
7-8
Valve Adjustments -
Function Manifold
How to Adjust the System Relief
Valve
Note: Perform this procedure with a minimum
hydraulic oil temperature of 32°F / 0°C and a
maximum hydraulic oil temperature of
120°F / 48°C.
Note: Be sure that the hydraulic oil level is between
the full and add marks on the oil level indicator.
1 Models with outriggers: Deploy the outriggers
and level the machine.
Models without outriggers: Chock both sides
of the wheels at the steer end of the machine.
2 Locate the system relief valve on the function
manifold (item D or AC).
3 Connect a 0 to 5000 psi / 0 to 350 bar
pressure gauge to the test port on the function
manifold (item F or AB).
4 Remove the platform controls from the platform.
Note: Perform this test from the ground with the
platform controls. Do not stand in the platform.
4 - 104
5 Determine the test weight for your machine.
Refer to the specifications below.
Rated work load at full height, maximum
GS-3390
GS-4390
(most models - refer to capacity indicator decal) 680 kg
GS-4390
(some models - refer to capacity indicator decal) 816 kg
GS-5390
6 Using a suitable lifting device, place the test
weight, determined in step 5, at the center of
the platform floor. Secure the weight to the
platform.
7 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. Start the engine.
8 Before serial number GS9003-41523: Press
and hold a function enable/high speed select
button.
After serial number GS9003-41522: Press
and hold the lift function enable button.
GS-3390 • GS-4390 • GS-5390
July 2007
REV G
2500 lbs
1135 kg
1500 lbs
1800 lbs
1500 lbs
680 kg
Part No. 72863