This particular model is Caterpillar's smallest and most compact roof bolter. It can be productive in the smallest spaces and in seam heights as low as 32 inches (81 cm). It has a single arm design with automatic temporary roof support and overhead canopies for the operator when tramming and bolting. While tramming, the operator can choose from two speed settings, and power is applied at each wheel to help it maintain traction in soft ground. Both simple and efficient, the RB120 is designed to get in and out of an entry quickly so production can resume.
Specifications of Caterpillar RB120 Roof Bolters
Caterpillar RB120 Roof Bolters Specifications
ATRS reach – with 26×7-12 tires
Bolt tightening torque (adjustable)
Chassis height – with 26×7-12 tires
Chassis overall width
Drill boom feed
Drilling feed thrust (maximum)
Drilling torque (variable)
Ground clearance – with 26×7-12 tires
Minimum tramming height – with 26×7-12 tires
Overall length with ATRS
Tram speed – fast
0-39.6 m/min (0-130 ft/min)
Tram speed – slow
0-18.3 m/min (0-60 ft/min)
Four wheel planetary drive; each drive consists of a Fairfield W1B torque hub along with Char-Lynn series 2000 hydraulic motor.
Two (2) push buttons located at tram and drill station.
Three (3) tape switch (panic strip) that de-energizes electrical system and applies automatic brake.
ATRS Support Cylinder
One (1) 89 mm (3.5 in) bore, double acting cylinder with pilot operated check valve.
Boom Feed Cylinder
One (1) 127 mm (5 in) bore, double acting cylinder with in line check valve.
Main system hoses are two wire braid rated at 621 bar (9,000 psi) burst pressure; MSHA 2G flame resistant approved; fittings JIC
Two stage gear pump rated at 94.6/56.8 L/min (25/15 gal/min) at 1,770 rpm with spline fit to pump motor.
446.7 L (118 gal) capacity reservoir with 7 micron return filtration, filter by-pass and “in tank” strainer.
Stab Foot Cylinder
One (1) 76.2 mm (3 in) bore, double acting cylinder.
Valve Banks and Auxiliary Controls
All valve banks are spring returned, bi-directional with main relief set at 138 bar (2,000 psi).
Valve Banks and Auxiliary Controls 1
One (1) main valve bank
Valve Banks and Auxiliary Controls 2
Two (2) auxiliary cable type controls
Valve Banks and Auxiliary Controls 3
Three (3) auxiliary controls
Valve Banks and Auxiliary Controls 4
All other pressures are set for each function accordingly.
Valve Banks and Auxiliary Controls 5
One (1) cable reel control operated by means of valve handle located in the operator’s tram station.
AUTOMATIC PARKING BRAKE
Two spring applied, hydraulic released, fail safe brakes at front of machine.
Size 3 electro-mechanical starter with heater strips, 1.5 kVA transformer and 100 amp circuit breaker.
Low profile rigid frame. The frame design is a box structure type for a light weight, high strength frame assembly.
OPERATOR’S DRILL STATION AREA
Drill boom feed function control.
Drill rotation function control.
Tool supply area on boom for drill steel, drill bits, bolts, resin, etc.
TRAM STATION AREA
Cable reel function control.
Full tram function controls.
Manually adjustable tram canopy.
Two pressure gauges.
Two parts manuals.
Seven (7) oil sampling kits.
Four point, 9.1 kg (20 lb) tank, multi-purpose, ABC dry chemical fire suppression system; manually actuated.
1930 mm (6 ft 4 in) reach H-type Design; one primary ATRS cylinder is required for this reach.
MID-MACHINE AREA (BETWEEN TIRES)
ATRS support function control.
Stab foot function control.
Inch tram function controls.
DUST SYSTEM BLOWERS
Guyan 3300 series blower rated 56 CFM at 12 in Hg, variable.
Belt driven; vacuum blower is directly driven from a hydraulic motor by means of sheaves and “v” belts.
Donaldson style dust collector box with internal separator, cyclone and filter.
Four 26×7-12 Solid Rubber Tires – 26 in maximum form diameter, tires mounted on formed rim assemblies.
Unit is supplied with 7.6 m (25 ft) of recommended cable.
457 mm (18 in) diameter for #4/3C Round Cable – 83.8 mm (275 ft) capacity reel for #4/3C, GGC round trailing cable.
Ocenco Incandescent Lighting – with one headlight on front and rear.
DRILL STATION CANOPY
Drill Station Canopy – Attached to A.T.R.S. support arm for operator coverage at drilling controls.
440 Volt AC Electrical System – pump motor rated at 29.8 kW (40 hp) for one hour at 1,770 rpm.
Splined insert for direct mounted pump and 440 volt AC heater strip.