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September 2016
8-2 Valve Adjustments - Function
Manifold
How to Adj ust the Primary Boom Dow n R elief Valv e
How to Adjust the Primary Boom
Down Relief Valve
Note: Perform this procedure with the boom in the
stowed position.
1
Connect a 0 to 3000 psi / 0 to 206 bar
pressure gauge to the test port on the function
manifold.
2
Start the engine from the ground controls.
3
Hold the function enable/rpm select toggle
switch to the high rpm position and activate
and hold the primary boom toggle switch in the
down direction with the primary boom fully
lowered.
4
Observe the pressure reading on the pressure
gauge. Refer to Specifications,
Component Specifications.
5
Turn the machine off. Hold the relief valve and
remove the cap (item K).
6
Adjust the internal hex socket. Turn it
clockwise to increase the pressure or
counterclockwise to decrease the pressure.
Install the relief valve cap..
Tip-over hazard. Do not adjust
the relief valve higher than
specified.
7
Repeat steps 2 through 6 to confirm the relief
valve pressure setting.
8
Remove the pressure gauge.
Part No. 1274592
How to Adjust the Secondary
How to Adj ust the Sec ondary Boom D own R elief Valv e
Boom Down Relief Valve
Note: Perform this procedure with the boom in the
stowed position.
1
2
3
4
5
Manifold
6
7
8
Z-34/22 IC
Service and Repair Manual
Connect a 0 to 3000 psi / 0 to 206 bar
pressure gauge to the test port on the function
manifold.
Start the engine from the ground controls.
Hold the function enable/rpm select toggle
switch to the high rpm position and activate
and hold the secondary boom toggle switch in
the down direction with the secondary boom
fully lowered.
Observe the pressure reading on the pressure
gauge. Refer to Specifications,
Component Specifications.
Turn the machine off. Hold the relief valve and
remove the cap (item J).
Adjust the internal hex socket. Turn it
clockwise to increase the pressure or
counterclockwise to decrease the pressure.
Install the relief valve cap.
Tip-over hazard. Do not adjust
the relief valve higher than
specified.
Repeat steps 2 through 6 to confirm the relief
valve pressure setting.
Remove the pressure gauge.
Manifolds
Manifold
59
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