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525C ®
Wheel Skidder
Engine |
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Grapple |
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Engine Model |
Cat® C7 ACERT™ |
Bunching Capacity |
1.16 m2 |
12.5 ft2 |
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Gross Power – SAE J1995 |
146 kW |
196 hp |
Thinning Capacity |
1.34 m2 |
14.4 ft2 |
Dimensions |
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Wheelbase |
3534 mm |
139.2 in |
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Weights |
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Est Operating Weight |
17 711 kg |
39,045 lb |
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• Operating weight includes enclosed cab, 30.5 tires, decking blade, arch, bunching grapple, winch
525C Wheel Skidder
The 525C wheel skidder sets the standard for productivity and durability.
Engine |
Power Train |
Hydraulics |
The Cat® C7 engine with ACERT™ technology is field proven and U.S. EPA Tier 3 compliant. The industry leading Caterpillar® lock up torque converter automatically engages/ disengages direct drive for maximum efficiency, performance and productivity. pg. 4
The field-proven Cat torque converter, heavy-duty transmission and high performance axles improve availability, performance and productivity, while minimizing fuel consumption. pg. 5
Serviceability |
Customer Support |
The state-of-the-art closed-center, variable displacement, pressure compensating hydraulic system provides power for braking, steering, blade and grapple functions. pg. 6
The 525C is designed to make regular maintenance easier, extend service intervals, and reduce the time required for maintenance. pg. 11
Your Cat dealer offers support you can count on, from purchase options to operator training, maintenance programs and unmatched parts availability … all to keep your Cat skidder up and running when you need it. pg. 12
Engineered to exceed customer expectations in the toughest applications. Caterpillar quality, improved serviceability and productivity provide maximum uptime
and lower owning and operating costs.
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Structures |
Operator Station |
Work Tools |
The 525C structures are Caterpillar designed and manufactured for the most demanding logging conditions. Durable box section mainframes and decking blade provide superior strength. pg. 7
Finger tip gear selection, 1/4 turn steering, improved ergonomic control layout and reduced operator lever effort contribute to the most comfortable operator environment. pg. 8
Large Cat grapples maximize production with a new tong profile and higher clamping forces. Raised edges and wear resistant cast tips provide added durability. The hydraulic winch is ideal for self-retrieval and log truck towing. pg. 10
New Feature
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Engine
The Cat power train delivers top performance, power, and durability.
Cat C7 Engine. The Cat C7 uses Caterpillar’s breakthrough ACERT™ Technology to meet exhaust emission reduction standards. It features efficient air management, fuel delivery and electronic control for high productivity and exceptional service life.
Engine Design. This four-stroke engine provides efficient fuel combustion. Precise engineering and thorough testing assure durability, reliability and plenty of power. Built-in serviceability and excellent fuel economy lower operating costs.
ACERT™ Technology. Caterpillar optimizes engine performance while meeting EPA Tier 3 regulations. ACERT™ Technology reduces emissions during the combustion process by using advanced technology in the air and fuel systems, in conjunction with integrated electronics. Caterpillar meets emission regulations at the combustion source rather than recycling exhaust gases.
ADEM A4 Control Module. Controls the fuel injector solenoids to monitor fuel injection. This system provides automatic altitude compensation, and it will not allow the engine to fire until it has oil pressure, acting as cold start protection and a form of pre-lube.
Turbocharger. The C7 features a waste gate turbocharger that provides high boost over a wider range, improving engine response and peak torque, as well as providing outstanding low-end performance.
Maintenance. The C7 engine reduces costs and downtime with a 500-hour oil change interval. Extended service intervals can save thousands of dollars over the life of a machine. Machines are equipped with Caterpillar high efficiency oil filters, whose revolutionary design doubles efficiency without increasing the change interval.
Water Pump. A dual thermostat control improves coolant flow and heat dissipation, resulting in better durability.
Electronic Transfer Pump. The electric fuel transfer pump is self-priming, eliminating the need for a manual priming pump.
Reliability Features. The C7 offers maximum reliability and response thanks to a range of features:
•Improved fuel injectors and pump
•Leak-free design
•Higher cylinder pressures
•Reinforced cylinder block
Leak-Free Design. Improved joints throughout the engine reduce the chance of leaks. The oil pan seal, timing
cover and block to flywheel housing incorporate a leak-free design proven in thousands of Cat on-highway truck engines in the field.
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Power Train
The integrated Cat power train delivers dependable, relentless pulling power.
Five-Speed Transmission. The field proven Cat power shift countershaft transmission easily matches engine power to the load size and ground conditions. Electronic control makes fingertip controls possible, reducing operator fatigue and improving comfort.
Gear Application. Gear ratios are carefully designed to maximize productivity in specific cycle segments and under specific loads.
•Gear 1 provides highest rimpull capability for heavy load applications.
•Gears 2, 3 for normal loads and higher speed operations.
•Gears 4, 5 provide excellent empty return and roading speeds.
Electronic Clutch Pressure Control.
The C-Series Skidders have an additional transmission feature for added performance and operator comfort
– the Electronic Clutch Pressure Control (ECPC). This unique feature provides smoother shifting and increases skidding performance by regulating and modulating the individual clutches based on current operating conditions.
Torque Converter. The large, heavyduty torque converter maximizes the productivity of the entire drive train.
The torque converter is matched to the Cat C7 engine for excellent rimpull and skidding performance. This lock-up torque converter has proven its durability over thousands of hours
of punishing loads.
Improved Productivity. The torque multiplication capability of the torque converter reduces the need for the operator to continually shift the transmission to maintain good skidder performance, as is required on competitive skidders. This reduces operator effort and improves machine productivity.
Lock-up Clutch. The integral lock-up clutch allows the machine to operate in converter drive for greater rimpull, or direct drive for high efficiency hauling and faster travel speeds. Direct drive capability allows up to 15% higher travel speeds when the lock-up clutch is engaged.
Auto Lock-up. The lock-up clutch automatically engages according to ground speed and engine speed conditions. This feature is handled
electronically and allows for increased travel speeds in the same gear.
Reduced Operating Costs. Torque converter direct drive capability, combined with the lock-up differential, reduces wheel slip. This minimizes rutting and soil damage in straightahead pulls on weaker soil. In turn, it minimizes tire wear, component stress and fuel consumption, reducing total operating costs.
Differential Locks. Normal operation is with the differential locks in both axles disengaged, meaning the all four wheels are free to drive independently. Locking a differential forces both wheels on an axle to turn in sync with each other.
Both front and rear differential locks are easily engaged and disengaged with a conveniently located switch on the right hand console. Hydraulically actuated differential locks allow for on-the-go engagement or disengagement.
Axles. Axles feature a full length oil sump with splash lubrication for excellent heat rejection and long component life. The 525C is available with two axle options – Standard Duty axles are used for most applications and tire sizes up to 30.5 32. A Wide Axle option is available for use in moderate to severe applications, or when using dual tires, wide flotation tires or chains.
Front Axle. The front axle features a pinion-mounted design and a heavy-duty housing, eliminating the need for the front axle guard.
Pivot Design. The oscillation pivot design provides industry leading ride comfort.
•15° oscillation absorbs minor shock loads caused by stumps and holes and helps isolate the cab from axle movement for a smoother, more comfortable ride.
•Front axle oscillation also provides excellent fore-aft stability for large capacity grapples and dual function arches.
Brake Components. Brake components are housed inside the axles, protecting them from dirt, dust and wet ground conditions. Inboard brakes allow for splash lubrication and cooling. They are virtually maintenance free, and provide reliable brake performance in the most demanding logging applications.
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Hydraulics
State-of-the-art hydraulic system provides dependable power and maximum efficiency.
Load Sensing Hydraulics. A load sensing variable displacement pump and pressure compensating system continually monitor hydraulic power requirements, then provides power based on demand.
Lower Power Consumption. The variable displacement hydraulic pump draws engine power only when braking, steering, dozer or grapple actuation demands flow or pressure. This conserves engine horsepower and increases fuel efficiency.
Cooling Demands. Load sensing hydraulics provide flow only when needed, saving fuel and generating less heat, allowing the cooling system to allocate more capacity to the engine, transmission and torque converter.
Oil Cooler. The oil cooler is located above the radiator for better hydraulic oil cooling performance and to make radiator cleanout easier.
Auto-Grab Feature. Auto-Grab, engineered by Caterpillar, constantly monitors tong pressure and adjusts as needed to securely hold grapple loads while skidding. It is easily activated on demand by a switch located on the right-hand control lever.
Cat ToughGuard™ Hoses. Caterpillar XT®-3 ToughGuard™ hoses improve hose life in the grapple, arch, boom and across the hitch. ToughGuard hoses have been very successful in reducing early hour hose failures. O-ring face seals assure rock-solid connections that maintain pressure and reduce oil leaks.
Steering. Fully hydraulic control. Meets the following standards: SAE J1511 OCT90, ISO 5010-1992.
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