Milton CAT 525C User Manual
®
®
525C
Wheel Skidder
Engine
Engine Model Cat®C7 ACERT™
Gross Power – SAE J1995 146 kW 196 hp
Dimensions
Wheelbase 3534 mm 139.2 in
Weights
Est Operating Weight 17 711 kg 39,045 lb
• Operating weight includes enclosed cab, 30.5 tires,
decking blade, arch, bunching grapple, winch
Grapple
Bunching Capacity 1.16 m
Thinning Capacity 1.34 m
2
2
12.5 ft
14.4 ft
2
2
525C Wheel Skidder
The 525C wheel skidder sets the standard for productivity and durability.
Engine
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
Serviceability
The 525C is designed to make regular
✔
maintenance easier, extend service
intervals, and reduce the time required
for maintenance. pg. 11
Power Train
The field-proven Cat torque converter,
heavy-duty transmission and high
performance axles improve availability,
performance and productivity, while
minimizing fuel consumption. pg. 5
Customer Support
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
Hydraulics
The state-of-the-art closed-center,
variable displacement, pressure
compensating hydraulic system
provides power for braking, steering,
blade and grapple functions. pg. 6
Engineered to exceed customer expectations
in the toughest applications. Caterpillar
quality, improved serviceability and
productivity provide maximum uptime
and lower owning and operating costs.
2
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
3
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.
4
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, heavy-
duty 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.
5
Hydraulics
State-of-the-art hydraulic system provides dependable power and maximum efficiency.
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.
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.
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.
6
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