Mec 3072ES - Hydraulic Pressure Adjustment Procedures

"3072ES / 3772ES / 3772ES HD" Service & Parts Manual October 2008
Page 4-35
HYDRAULIC PRESSURE ADJUSTMENT PROCEDURES
• Before attempting to check and/or adjust pressure relief valves, operate the machine for
15 minutes or long enough to sufficiently warm the hydraulic fluid.
• Insert a 0-5000 psi gauge onto the pressure test port on the valve manifold using gauge
adapter fitting MEC part no. 8434
Pressure Adjustment Table
ART_2579
Hydraulic
Pump
1
5
1
5
RV1
Lift Relief
RV2
Steer Relief
RV3
Main Relief
RV4
Overpressure
Relief
LEFT SIDE
FRONT
LIFT CYLINDER
MANIFOLD, 3772
Gauge Port
(Test Port)
STEER
2000 PSI 137.9 bar
2000 PSI 137.9 bar
2000 PSI 137.9 bar
MODEL
3072ES
3772ES
3772ES HD
MAIN
2800 PSI 193 bar
2800 PSI 193 bar
3000 PSI 206.8 bar
LIFT
2500 PSI 172.4 bar
2500 PSI 172.4 bar
2500 PSI 172.4 bar
Adjusting Relief Valves
• Remove the tamper proof cap.
• Turn adjustment screw “IN” to increase pressure.
• Turn adjustment screw “OUT” to decrease pressure.
• When correct pressure is obtained replace tamper proof cap with a new one.
Caution: Do not operate pump with tamper proof cap removed as fluid will
emit under pressure.