MEGA Corp. MMP4-2 - Manual (Page 22)

MMP 4-2
5 Nov 2011
SECTION 4
Basic Hydraulics System
4-7
REPAIR
Hydraulic tank assembly
1. Repair, secure or adjust as required.
Hydraulic Pump
1. Repair or replace as required.
Hydraulic Control Valve
1. Repair, adjust or replace as required.
2. To set hydraulic relief pressure, install a 0 –
3,000 psi (0 – 21,000 kpa) pressure gauge
on the test fitting located on the retract hose
(RAISE) for the inlet boom cylinder.
3. With the engine operating at high idle,
operate the inlet boom UP lever and
observe the reading on the pressure gauge.
4. If the hydraulic oil pressure is not within
the specifications, adjust the pressure
regulator cartridge as follows:
a. To increase the pressure, loosen the
lock nut on the regulator stem and
screw in the stem clockwise (CW) until
the pressure is at 2,100 psi (14,450
kpa), tighten lock nut on stem.
b. To reduce the pressure, loosen the lock
nut on the regulator stem and unscrew
the stem counter clockwise (CCW) until
the proper pressure is obtained, tighten
lock nut on stem.
c. Recheck hydraulic pressure.
d. Shut unit off.
e. Remove pressure gauge from test port.