Gradall 544D (9136-4003) Service Manual - Manual (Page 321)

7.0 H
YDRAULIC
S
UB
-A
SSEMBLY
F UNCTION AND M AJOR C OMPONENTS
The hydraulic sub-assembly locates primarily in boom-section 4. It is fastened to the
bottom of the fourth section and the rear of boom-section 3. Its function is to control hose
(and optional electric cable) movement as the booms extend and retract.
Major components are
2 Structural Channel Weldments
(Hydraulics Carriers)
Hydraulic Tubes
Hydraulic Hoses
Hose Carrier Guid
Bearing Pad
Guide Bracket
Components on the left side of the assembly service the carriage tilt cylinder of the
machine. Components on the right side of the assembly service hydraulic and electric
options on the machine.
O PERATION
As the boom extends or retracts, the hydraulics carrier (fastened to the bottom of boom-
section 4) moves to the front or rear of the hydraulics carrier fastened to the back of
boom-section 3. The moveable hose carrier rolls forward or backward, protecting looped
hoses as they extend and retract.
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l
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B OOM -S ECTION 4:
S HOWING H YDRAULIC S UB -A SSEMBLY
F RONT V IEW:
R EAR V IEW:
H YDRAULIC S UB -A SSEMBLY
GRADALL GRADALL