National Crane 600H, Service Manual

Page: 215 / 232

NATIONAL CRANE
08-19-2022 Control # 092-13
9-33
600H SERVICE CRANE INSTALLATION
9
Install the Hydraulic System
The hydraulic system pressure is supplied by a three section
pump mounted on the truck power take off (PTO). Two
sections are vane pumps the third section is a gear pump.
The pump supplies the following at governed rpm:
• P1 supplies 34 gpm (128.7 lpm) at 3300 psi (227.5 bar)
for the hoist circuit. (Vane Section)
• P2 supplies 18 gpm (68 lpm) at 3900 psi (268.8 bar) for
the boom and outrigger circuits. (Vane Section)
• P3 supplies 10 gpm (37.8 lpm) 2350 psi (162 bar) for the
swing circuit. (Gear Section)
Install the hydraulic tank (Figure 9-16) behind the cab.
Connect the hydraulic hoses to the pump sections as
marked.
Section P1 to
Hoist Valve
Section P2
to Multibank
Mid-Inlet
Section P3
to Multibank
Main Inlet
Return
One Gear and Two Vane Sections
FIGURE 9-15
Transmission
Pump
PTO
Included with
Transmission
Included
with Pump
Large radius bends
on support bar do
not support pump
vertically.
Support Bar
FIGURE 9-16
Hydraulic
Tank
Mounting
Bracket
Gate Valve
Suction Line
to Pump
Note: Be sure the
hydraulic tank is full and
the gate valve is open
before starting the pump.
Return Line
REFERENCE ONLY