7032 SOUTH 196th - KENT, WA 98032 - (253) 872-0141 / FAX (253) 872-8710
OPERATION / MAINTENANCE MANUAL
MODEL 50 VIBRATORY HAMMER WITH MODEL 260 POWER UNIT
VII. MODEL 260 POWER UNIT
VII-1. Hydraulic Circuitry
The following are descriptions of the components that make up the Hydraulic Circuitry of the APE Model
260 Power Unit.
VII-1A. Clamp Circuitry (Used for extending and retracting jaw cylinder)
Oil for the clamp circuit is provided by item #12 the clamp pump. This pump is a 1.16 cu.in/rev 5000 psi
piston pump. All oil to the inlet of this pump is filtered through a suction strainer located in the tank. Clamp
oil is then directed from the pump to the clamp directional control valve item #33. When the clamp switch
is in the "off" position, the oil flows through the clamp directional control valve (item #33) and back to the
oil tank. All hydraulic oil returning to tank is filtered with item #8 (return filter). When clamp switch is
moved to open, solenoid "A" on the clamp directional control valve is energized the oil will flow out to
the clamp cylinder and retract or open the jaws. The clamp open pressure can be seen on the clamp
pressure gage item #7. When the clamp switch is moved to the closed position, solenoid "B" will be
energized and oil flow will be directed to the clamp cylinder. The clamp cylinder will then extend or close
the jaws. Clamp pressure can be seen on the clamp close switch item #36 will de-energize solenoid
"B". This will direct pump oil flow back to oil tank. Clamp pressure is
maintained in clamp cylinder by a pilot operated check valve, item #34. At any time should the clamp
pressure fall below 3000 psi. the clamp pressure switch will re-energize solenoid "B" on the clamp
control valve item #33, and direct pump flow to the clamp cylinder. Maximum clamp pressure is limited
by item #32, the clamp pressure relief valve set at 3300 psi. The quick disconnect couplers, items #37
permit de-coupling of clamp hoses.
VII-1B. Drive Circuit (Used for operating APE vibrator, APE drill or any other unit)
There are two pumps, item #13 that direct oil to the drive circuit (Vibro Motor). The maximum drive
pressure is controlled by the drive pressure relief valve, item #25, to 3500 psi. max. When the drive
switch is moved to the forward position, solenoid "A" of the drive directional control valve is energized,
item #22. Oil flow is directed to the vibro motors to rotate the eccentrics. When the drive switch is moved
to the off position, oil flow is directed back to the tank through the drive directional control valve and
solenoid "A" is de-energized. Because of the high oil flow in the drive circuit, APE, Inc. has developed
a circuit that eliminates high shock loads. Items #30, 27, & 24 are small internal components located
in the drive manifold that provide a soft shift feature for the drive directional control valve. Item #30 is
a small adjustable snubber valve, item #27 is a small shuttle valve and item #24 are small fixed orifices.
The orifices, item #24 are used to dampen the shifting of item #22. This provides a soft start/stop of
the drive directional control valve preventing hydraulic shock to the drive system. The shuttle valve, item
#27 is used to send a hydraulic signal to the drive pressure relief valve item #25, when the drive
directional control valve is centered of de-energized. This hydraulic signal tells the drive pressure control
valve to open and allow any high flow, high pressure back to tank. The snubber valve item #30 simply
controls how fast this signal is received by the drive pressure relief valve item #25. The drive pressure
can be read on the drive pressure gage item #7. Item #26 is the oil temperature control valve that directs
oil flow to the heat exchanger item #9 when oil temperature increases.
The quick-disconnect couplings (QD #38 & 39) permit de-coupling of the drive and case drain hoses
at the power unit.
Page 7-1
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