Labrie Pendpac WITTKE RETRO FL Maintenance Manual page 120

110 Maintenance
Figure 3-55 Pressure relief valve (top inlet section)
4.
Loosen the locknut and turn the screw clockwise to increase system pressure, counterclockwise
to decrease.
5.
Repeat step 2.
6.
When the hydraulic pressure is set to 2250 psi, tighten the locknut and recheck.
7.
Remove the gauge and replace the plug.
Residential Front Loader
Residential Front Loaders are equipped with two pressure relief valves in the top inlet and mid-inlet
sections.
The pressure relief valve fitted into the mid-inlet section is responsible for the main system pressure
relief. The pressure relief valve fitted into the top inlet section is responsible for the cart tipper, or
auxiliary hydraulic attachment work section. The top inlet section relief valve is set slightly higher
since the cart tipper circuit is protected with work port relief valves set at 1500 psi (refer to "Auxiliary
Hydraulic Attachment Work Section" on page 104).
To adjust the main system pressure:
N : The system pressure should be at 2250 psi.
OTE
1.
Remove the plug from the test port located at the top of the main valve bank. Insert a 0-3000 psi
pressure gauge (see Figure 3-54).
2.
With the engine running and the pump switch ON, raise the engine RPM to 1500 and return all
hydraulics to their 'home' position (packer blade at front of body, arms down, forks down,
hopper top door open, tailgate closed, body down). Operate one hydraulic function and note the
reading on the gauge.
3.
If adjustment is required (system pressure is higher or lower than 2250 psi), switch off the pump
and locate the pressure relief valve screwed into the mid-inlet section valve bank (see Figure 3-56).