The Cat 527 Skidder is designed and built specifically for log skidding applications. The 527’s extended track roller frame and weight-forward bias make it well suited for mountainous and soft underfoot logging operations. The skidder’s ergonomic and spacious operator’s environment allow for increased comfort and production. The 527’s standard forestry guarding and undercarriage design ensure the durability required in logging applications. Both Cable and Swing-boom Grapple configurations are provided to suit a wide range of skidding applications.
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Swing Boom Grapple
The 527’s superior balance and extended track roller frame provide a superior platform for grapple skidding. The machine’s weight distribution and longer undercarriage combine to offset the weight and pull of grapple loads and to keep the front of the tractor on the ground. The tractor’s balance and pulling ability are most evident in uphill skidding applications, poor underfoot conditions, and side-slope skidding. With a swing boom attachment, the 527 needs less maneuvering and positioning to reach downed timber delivering high productivity, and less ground disturbance.
The 5P Power Angle Tilt (5P-PAT) blade is a highly versatile tool that allows complete blade adjustment from the operator’s compartment. The ability for the operator to angle and tilt the dozer while operating is a significant performance and productivity enhancer. The operator can hydraulically adjust angle and tilt on the go, to focus the 527CA weight and horsepower on tough digging spots, effectively increasing the 527 digging forces to that of larger tractor. Further, hydraulic angle and tilt allows precise placement of material for faster doze cycles, and more efficient terracing and pioneering. With the knowledge of industry expectations gained since the introduction of the 527CA, Caterpillar designed a 527 PAT dozer specifically for Asian market requirements. It combines the control advantages of the 5P-PAT, with the durability and ease of material casting performance of the MA. The new 527 PAT dozer provides machine width coverage when fully angled, but will not compromise the 527’s balance and stability in adverse terrain maneuvering. With appropriate dozer width, improved cutting edge angle and moldboard curvature, combined with the performance advantage of hydraulic angle and tilt, the 527 PAT dozing capabilities can be raised to equal the industry standard D6G.
The 124 gross kW (166 gross horsepower) and a torque converter driveline provide a 49 percent torque rise and a drawbar pull of 30 276 kg-force (66,746 lb-force). This pulling power enables the 527 to overcome drag loads created during skidding.
The combination of tractor balance, torque converter drive train and high drawbar pull enable the skidder to offset the weight and overcome drag loads created during winching situations. The 527 winch is a durable and productive tool that delivers an impressive 31 388 kg-force (69,200 lb-force) of line pull.
527CA Winch with FreespoolCable Size – Optional - 0.88 in
Cable Size – Recommended - 0.75 in
Drum Capacity – Optional Cable - 180 ft
Drum Capacity – Recommended Cable - 267 ft
Drum Diameter - 10 in
Drum Width - 13 in
Maximum Linepull - 69200 lb
Maximum Linespeed - 143 ft/min
Weight - 2600 lb
Dimensions CA – Overall width without Blade and with 559 mm (22 in) shoes - 107.09 in
GR – Overall width without Blade and with 760 mm (30 in) shoes - 118.9 in
Undercarriage – Cable Grouser Height - 2.56 in
Shoes/Side - 41
Track Gauge - 85.04 in
Track Rollers/Side - 7
Track on Ground - 112.05 in
Width of Shoe - 22.01 in
Width of Shoe – optional - 24.02 in
Blades 527 PAT – Blade Capacity* - 3.07 yd3
527 PAT – Blade Height - 36.3 in
527 PAT – Blade Width - 136.22 in
5P-PAT – Blade Capacity* - 4.93 yd3
5P-PAT – Blade Height - 47.24 in
5P-PAT – Blade Width - 128.82 in
Blade Types - 5P-PAT, 527 PAT
Service Refill Capacities Cooling System - 9.7 gal
Engine Crankcase and Oil Filter - 5.8 gal
Final Drive (each side) - 1.7 gal
Fuel Tank - 75.3 gal
Hydraulic Tank - 10.5 gal
Recoil Spring Housing (each side) - 7.1 gal
Transmission - 39.1 gal
Winch Sump (527 Winch) - 19.5 gal
Undercarriage – Grapple Grouser Height - 2.56 in
Shoes/Side - 43
Track Gauge - 85.04 in
Track Rollers/Side - 8
Track on Ground - 126.34 in
Width of Shoe - 29.92 in
Engine Net Flywheel Power - 150 hp
Engine Model - Cat® 3304 DIT
Gross Power - 166 hp
Displacement - 425 in3
Weights Operating Weight – Cable - 41217 lb
Operating Weight – Grapple - 48281 lb
Transmission Steering - Clutch/Brake
Torque Converter Type - Skidder
Travel Speeds – Fwd. 1st - 2.3 mph
Travel Speeds – Fwd. 2nd - 4.1 mph
Travel Speeds – Fwd. 3rd - 7.1 mph
Travel Speeds – Rev. 1st - 2.8 mph
Travel Speeds – Rev. 2nd - 5.1 mph
Travel Speeds – Rev. 3rd - 9 mph