This task covers:
Trailer parked, lowered to level ground, brakes
Tool set, general mechanics,
engaged and wheels chocked.
A reading of 2500 psi is only on gauge when hydraulic controls are in use.
Readings will go down to 500 psi when levers are disengaged.
The psi will vary due to load. Hydraulic pressures will vary from 300 to 2500
psi under normal operation and will reach a maximum of 2500 to 2800 psi
under full load.
Raise the gooseneck tilt support lever (2) until the support arm is fully raised.
While continuing to hold the support lever (2) raised, check the psi reading on the
pressure gauge (1). The psi reading should be 2500 to 2800 psi. If the psi reading is
higher than 2800 psi, or lower than 2500 psi, adjust the pressure by adjusting the pressure
relief valve (6).
Remove the small barrel nut (4) on the pressure relief valve (6) and loosen the larger
retaining nut (5) using a 1 1/16 in. deep-well socket.
Rotate clockwise the six-sided allen stud (3) located inside the barrel nut (4) on the
pressure relief valve (6 ) to raise the pressure setting, or counter-clockwise to lower the
Install the barrel nut (4) to lock the allen stud (3) in position and retighten the
retaining nut (5).
Repeat steps (1) and (2). If the pressure reading is still not correct, verify the pressure on
the prime mover supply system and continue to Step (7).
Remove the small barrel nut (8) on the directional control valve (10) and loosen the larger
retaining nut (7) using a 1 1/16 in. deep-well socket.
Do not exceed 3000 psi. Serious injury or death may occur if pressure
exceeds 3000 psi.