Huskie Tools HH100, Service Manual

Page: 7 / 64

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2. OPERATING INSTRUCTIONS
HOW THE HAMMER OPERATES
The main valve (Figure 1) for the hammer is built into the cylinder. Hydraulic oil is
supplied into the hammer through this valve. During the upward stroke, the pressure in
the upper chamber is released via the main valve and through the outlet. High pressure in
the lower chamber then forces the piston upward.
As soon as the piston reaches the upper end of the stroke, the main valve directs flow to
the upper chamber causing it to become high pressure.
Since surface
A is greater than surface B , the piston is driven downward with the help of
the accumulated energy from the gas chamber, creating the impact stroke of the hammer.
At the point of impact, the main valve shifts, releasing the high pressure from the upper
chamber, enabling the upward stroke to occur again.
Figure 1. Principles of Operation.
(Refer to Table 10 page 26.)
GAS
CHAMBER
PRESSURE
RECIEVING
SURFACE A
PRESSURE
RECIEVING
SURFACE B
LOWER CHAMBER
(HIGH PRESSURE)
TOOL
MIDDLE CHAMBER
(LOW PRESSURE)
BUILT-IN MAIN
VALVE
UPPER CHAMBER
(VARIABLE
PRESSURE)