HYDRAULIC SYSTEM 777 SERVICE MANUAL
2-18 Published 10-01-2012, Control # 045-08
Pump Identification
Pump
Number
Identification
0 Front Load Drum
1* Rear Load Drum or
Luffing Hoist
2Boom Hoist
3 Swing
4 Right Crawler
5 Left Crawler
10* Auxiliary Load Drum
* When crane does not have an
auxiliary load drum, Pump 1 is
mounted next to pump drive.
When crane has an auxiliary
load drum, Pump 10 is
mounted next to pump drive
and Pump 1 is mounted on
rear of Pump 10.
Pump Port Identification
Pump
Number
Flow From
Port A
Flow From
Port B
0, 1, 2, 10 Raise Lower
3 Right Left
4 Reverse Forward
5 Forward Reverse
A1032
When Oil Flows in Direction
of Arrows, Functions
Operate in Directions
Indicated in Parenthesis.
To Brakes
To Accessories
To Supercharge
A
B
From
A
To
B
Swing
B
B
A
AB
A
A
B
A
B
B
A
A
B
Boom Hoist
Cylinders
Up
Down
Up
Down
To
A
From
B
Swivel
A
B
To
B
From
A
B
A
From B
To A
Oil Flow Diagram
3
1 or 10
2
5
4
Rear Drum
(Raise)
Front Drum
(Raise)
Left
Crawler
Right
Crawler
Drive
Shaft
Drive
Shaft
0
(Raise)
(Forward)
(Forward)
(Right)
FIGURE 2-16
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