Bullwheel Tensioner – T-7212

Bullwheel Tensioner – T-7212


The Sherman + Reilly Revolution Series T-7212 is a bullwheel tensioner built with two pairs of 72 in. 5-groove bullwheels (4 total) and a max tensioning capacity of 12,000 lbs per sub-conductor or bullwheel. Each bullwheel has its own planetary gearbox and hydraulic motor with spring-applied hydraulic release brake. A precision, microprocessor-controlled motor drive enables inching, even under maximum load.

The T-7212 includes an Automatic Tensioning System which maintains an operator set tension. The automatic bullwheel synchronization system maintains equal sag of all conductors, while recording/displaying tension and distance, and permitting manual override. In addition to tensioning mode, the T-7212 can operate in a pull-drive mode for easy rewinding of unused conductor.

With state of the art design to ensure operator safety, the T-7212 features a Safe Zone Cab™. This enclosure is designed to keep an operator off the ground while the equipment is in use. Built with a fully adjustable, ergonomic seat and a full set of electronic controls and gauges. The Safe Zone Cab™ is designed to reduce operator fatigue thereby reducing errors and injuries in the field, also reducing the risk of “touch potential” in energized environments.

The T-7212 is mounted on a 5th wheel trailer, has PLC machine control with CAN-bus technology, uses a removable/replaceable memory card to store all relevant stringing data, self-diagnostic system for all hydraulic circuits, and a PTO for reel stand control. In addition to tensioning mode, the T-7212 can be operated in a pullback mode for easy rewinding of unused conductor and in forward drive for ease of bullwheel reeving.

Tensioning Capacity, max.: 12,000 per bullwheel
Line Speed, max.: 4 mph
Bullwheel Size: 72 in. dia.
Bullwheel Count: 4 ea. (2 pair)
Bullwheel Groove Count: 5 per bullwheel
Groove Radius: 1-1/8″
Groove Lining Material: Polyurethane, machine-groove
Tensioning Brake: Hydraulic, motor-driven
Brake Control: Automatic, per operator setting
Drive System: Hydraulic
Engine: Diesel, 80 HP, water-cooled
Hydraulic Fluid: ISO Grade 32
Hydraulic Reservoir: 20 gal.
Fuel Capacity: 12 gal.
Fairlead Rollers: 4 ea., 2 front, 2 rear, adjustable
Fail-Safe Brake: Spring-applied, released by hydraulic pressure
Operator’s Safety Enclosure: Safe-Zone Cab, full enclosure with A/C and heat
Frame Construction: Steel tubing, continuous-weld
Length, overall, nom.: 34 ft., 6 in.
Width, overall, nom.: 8 ft., 6 in.
Height, overall, nom.: 12 ft., 4 in.
Weight, nom.: 21,500 lb.
GVWR: 30,000
Suspension: 5th wheel, air ride
Axle Configuration: 5th wheel, tandem
Brakes, trailer: Air
Towing Attachment: 5th wheel
Safety Chains: 5th wheel
Front/Nose Jack: 2 hydraulic, 2 manual
Rear Jacks: 2 hydraulic, vertical cylinder
Electrical System: Split 12/24 VDC
Lights, illumination: Cab-top floods
Lighting: US DOT, LED, 12 VDC
Battery: Dual, 12 V
Grounding: 3/4 in. dia. copper-clad steel ground loops, (4)
Paint: S+R white
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