Service and Repair Manual July 2019
Manifolds
66 S-40 XC • S-45 XC • S-40 TraX • S-45 TraX Part No. 1286829GT
How t o Adj ust t he B oom Exte nd R el ief Valv e
How to Adjust the Boom Extend
Relief Valve
Note: Perform this procedure with the machine in
the stowed position.
Note: Refer to the Function Manifold Component
list to locate the Boom Extend Relief valve.
1 Connect a 0 to 5000 psi / 0 to 350 bar
pressure gauge to the ptest port on the
function manifold.
2 Start the engine from the ground controls.
3 Press and hold the function enable button.
Activate and hold the primary boom extend
switch with the boom fully extended.
4 Observe the pressure reading on the pressure
gauge. Refer to Specifications, Hydraulic
Component Specifications.
5 Turn the engine off. Use a wrench to hold the
relief valve and remove the cap. Refer to
Repair Procedures, Function Manifold
Components, item BG.
6 Adjust the internal hex socket. Turn it
clockwise to increase the pressure or
counterclockwise to decrease the pressure.
Install the relief valve cap.
-over hazard. Do not adjust
the relief valve higher than
specified.
7 Repeat this procedure beginning with step 2 to
confirm the relief valve pressure.
8 Remove the pressure gauge.
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