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G-660C & G-880C GRADALL (Crawler)
The center pin (swivel joint) is used to transfer
hydraulic oil for the crawler travel and brake system
from the upperstructure to the crawler.
Oil enters the inlet section on top and passes to the
outlet section through internal ports machined in the
pin. The outlet ports are sealed from each other by O
rings installed in the center pin.
TOP SIDE
OF CENTERPIN
1.
From R Track Valve
2.
From L Track Valve
3.
From R Track Valve
4.
From L Track Valve
A.
To Dump
B.
From Two Speed
Selector Valve
D.
To Brake & Cooling
E.
To Dump
15
OPERATION & MAINTENANCE
CENTER PIN
BOTTOM OF
CENTERPIN
1.
To R Track Motor
2.
To L Track Motor
To R Track Motor
3.
To L Track Motor
4.
A.
Drain Line
B.
To Motor Swash Plates
D.
To Motor (Braking &
Cooling
Motor & Brake Drain
E.
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