Counterbalance Safety Valves

The inner, knuckle and extension boom cylinders are equipped with pilot operated counterbalance valves integral to the cylinder on the load holding sides. The stabilizer cylinders are equipped with dual pilot operated check valves. The counterbalance valves positively hold the load during normal operations. The valves additionally provide collapse protection in event of a hydraulic system failure or hose break. The counterbalance valves further control the metering of lowering functions and provide thermal relief protection in event of hydraulic oil expansion due to ambient temperature conditions. The dual pilot operated check valves positively lock the cylinder in position until the operator intentionally controls that function.

Rotation System
Slewing is accomplished by means of a rotation turntable bearing driven by a low-speed, high-torque motor through a reduction gearbox by means of a spur gear pinion.

Hydraulic System
The 6500 Series hydraulic system utilizes a PTO driven pump providing the minimum 8 gallons per minute hydraulic flow at 2600 PSI system pressure. An eight section stack type valve is provided as standard equipment. The standard 6500 crane configuration utilizes 6 of the valve sections, with the remaining two sections plugged, but available for use with optional equipment. Dual control stations are provided for all eight valve sections. The complete hydraulic system includes the hydraulic tank, suction line strainer, pump, 8 section directional control valve, return line filter and all required hoses and fittings.

Optional Equipment

Boom Options
The 6500 series is available with several boom configurations to meet various reach requirements. The shortest available boom is model 6517 with reach to 17 feet. Model 6521 has one hydraulic extension. Model 6526 has two hydraulic extensions and model 6531 has two hydraulic extensions plus a manual pullout.

Stabilizer options
The 6500 series cranes are available with either H-Frame out and down type stabilizers or A-Frame angled stabilizers.

Hydraulic Stabilizer Extension
Provides two each 2.00" bore cylinders for hydraulic extension of stabilizers. This option utilizes the 7th and 8th valve sections unused with the standard crane. This option available for H-Frame type outriggers only.

Hydraulic Winch
Boom mounted winch system provides hydraulic motor driven winch with 5000 pounds (2268 KG) single line pull. Winch option is equipped with complete hydraulic winch installed with 85 feet (25.9 M) of 7/16" (11.1 mm) diameter cable, moveable sheave block and ball bearing swivel hook with latch. An additional directional valve is included when crane is also equipped with optional hydraulic stabilizer extensions.

Anti Two-Block System
Boom tip weighted switch and two unloading solenoid valves are provided to stop boom extension and winch raise functions in event of accidental operation of the winch hook into the boom tip. System provides protection of crane components and ensures operator safety. This option available only with above hydraulic winch option.

Cable Remote Control System
Option provides solenoid operated directional control valves for control of all crane functions except stabilizer functions. System includes solenoid operated directional control valve and toggle switch operated remote control pendant with 35' (10.6 M) cable.

Radio Remote Control System
Option utilizes the same solenoid operated direction valve as cable remote above except is provided with a hand held control which functions by radio wave transmission and eliminates the attached cable, thereby allowing unrestricted operator movement during crane operation. System has a range of more than 200' (60.9 M) and uses multiplexing signal control to assure there is no interference from other radio signals. FCC approved.

Proportional Speed Control System
Option incorporates a electrically controlled variable flow control valve which provides speed control of crane functions. Function speed can be varied from no movement to full speed at maximum system flow. This optional system can be used with either cable or radio remote control systems.

Auxiliary Stabilizers
Additional stabilizers can be provided for situations that may be required by the crane application.

Boom Tip Hydraulics
Provides hydraulics routed to the boom tip for auxiliary attachments.

Auxiliary Attachments
A wide variety of boom attachments are available including rotators, clamshell buckets, grapples and pallet forks.