Designed for maximum productivity, the 994D builds on its productive tradition with innovations that enhance performance, reliability, durability and operator comfort, to lower your cost-per-ton.

Net Power 1250 hp
Engine Model Cat® 3516B EUI
Gross Power 1375 hp
Net Power - Caterpillar 1375 hp
Net Power - ISO 9249 1375 hp
Net Power - SAE J1349 1361 hp
Bore 6.7 in
Stroke 7.6 in
Displacement 4221 in3
Peak Torque @ 1,100 rpm 5786 lb ft
Torque Rise 33 %
Net Power - EEC 80/1269 1375 hp

Operating Specifications
Operating Weight 421600 lb
Rated Payload 38 tons
Rated Payload - Standard 38 tons
Rated Payload - High-Lift 34 tons
Bucket Capacity Range 15-31 m3 19.5-41 yd3
Cat Truck Match - Standard 785C, 789C
Cat Truck Match - High Lift 789C, 793C
Articulation Angle 40 Degrees

Bucket Capacities 15-31 m3 19.5-41yd3
Max. Bucket Capacity 41 yd3

Transmission Type Cat planetary power shift
Forward 1 4.6 mph
Forward 2 8 mph
Forward 3 14.1 mph
Reverse 1 5 mph
Reverse 2 8.9 mph
Reverse 3 15.5 mph

Maximum Single-Wheel Rise and Fall 26.65 in
Front Fixed
Rear Trunnion
Oscillation Angle 10

Hydraulic Cycle Time
Rackback 6 Seconds
Raise 12.5 Seconds
Dump 3.4 Seconds
Lower Float Down (Empty) 4 Seconds
Power Down 7.4 Seconds
Total Hydraulic Cycle Time 19.9 Seconds

Hydraulic System - Steering
Steering System - Circuit Closed
Steering System - Pump Piston, variable displacement
Max Flow @ 1,710 rpm (6900 kpa) (2x) 112 gal/min
Relief Valve Setting - Steering 4495 psi
Number of Steering Pumps 2

Service Refill Capacities
Fuel Tank 1226 gal
Cooling System 129 gal
Crankcase 75.5 gal
Transmission 92 gal
Differentials and Final Drives - Front 164.05 gal
Differentials and Final Drives - Rear 164.05 gal
Differential/Final Drives (each) 164 gal
Hydraulics - Lift/Tilt 164 gal
Hydraulics - Brake Cooling 6 gal
Hydraulics - Steering/Brake 66 gal
Pump Drive - Front 2 gal
Hydraulic System (including tank) 235.91 gal

Hydraulic System - Lift/Tilt
Lift/Tilt System - Circuit Closed
Lift/Tilt System - Pump Piston, fixed displacement
Max Flow at 1,710 rpm (3x) 329 gal/min
Relief Valve Setting - Lift/Tilt 4408 psi
Cylinders - Lift/Tilt Double-acting
Lift Cylinder - Bore 13 in
Lift Cylinder - Stroke 65.4 in
Tilt Cylinder - Bore 10.5 in
Tilt Cylinder - Stroke 44.9 in
Number of Lift/Tilt Pumps 3
Number of Lift Cylinders 2
Number of Tilt Cylinders 2

Height to Top of Exhaust Stacks 22.7 ft
Height to Top of ROPS/FOPS 22 ft
Height to Top of Hood 15.6 ft
Height to Center of Axle 5.7 ft
Bumper Clearance 4.6 ft
Ground Clearance 2.7 ft
Reach at Max. Lift/Dump - Std 7.4 ft
Reach at Max. Lift/Dump - HL 9.3 ft
Clearance at Max. Lift/Dump - Std 18.4 ft
Clearance at Max. Lift /Dump - HL 19.5 ft
Bucket Pivot at Max. Lift - Std 26.8 ft
Bucket Pivot at Max. Lift - HL 27.9 ft
Overall Height Bucket Raised - Std 37.19 ft
Overall Height Bucket Raised - Std 36.1 ft
Overall Height Bucket Raised - HL 37.2 ft
Length - Rear Axle to Bumper 14.8 ft
Wheel Base Length 21 ft
Length - Front Axle to Bucket Tip - Std 19.4 ft
Length - Front Axle to Bucket Tip - HL 22 ft
Overall Length - Std 55.1 ft
Overall Length - HL 57.7 ft
Width Over Tires 18 ft
Hinge Pin Height at Full Lift - Std 26.76 ft
Length with Bucket on Ground 666.49 in

Hydraulic System - Pilot
Pilot System - Circuit Closed
Pilot System - Pump Gear
Max Flow at 1710 rpm 20.6 gal/min
Relief Valve Setting - Pilot 348 psi
Number of Pilot Pumps 1

Cab/ROPS SAE J1394 SAE J11040 APR88 ISO 3471-1 1986
Cab/FOPS SAE J231 JAN81 ISO 3449 1992 Level II
Cab Sound* ISO 6394: 1998
Cab Vibration EC 89/392EEC
Brakes SAE J1473 OCT90 ISO 3450 1992

Power Train
Cat power train delivers smooth, responsive performance and reliability in tough conditions.

Power Train

Field-proven Cat 3516B EUI turbocharged and aftercooled diesel engine delivers high power and reliability in the world's most demanding mining applications. The 3516B is a 16-cylinder, four-stroke design and uses long, effective power strokes for more complete fuel combustion and optimum efficiency.

Engine Features
  • Three-ring, two-piece pistons with high strength forged steel crowns and lightweight aluminum skirts.
  • Steel-backed, copper-bonded aluminum bearings.
  • Uniflow cylinder head design with four alloy steel valves per cylinder.
  • High carbon steel alloy crankshafts with hardened journals.
  • Pressure lubrication with full-flow filtered oil and heat exchanger oil cooler.
  • Direct-electric 24-volt charging system.

High Torque Rise
With 33% torque rise, the 3516B delivers high lugging forces during digging and acceleration in high rimpull conditions for maximum efficiency and fast cycle times.

Enhanced Life
High displacement, low rpm rating and conservative horsepower ratings mean more time in the field and less time in the shop.

Electronic Control Module (ECM)
The ECM is the electronic "brains" of the power system. Computerized system senses operating conditions and power requirements and adjusts engine for most efficient operation at all times.

Electronic Unit Injection (EUI)
The electronically controlled unit injection fuel system senses operating conditions and regulates fuel delivery for optimum fuel efficiency.

Advanced Diesel Engine Management (ADEM)
ADEM system controls fuel injector solenoids to start and stop fuel injection for superior performance, greater reliability, cold start protection, automatic altitude compensation and air filter restriction indication.

Separate Circuit Aftercooler
Allows aftercooler circuit to operate cooler than jacket water temperature for a denser air charge and greater combustion.

Ether Starting Aid
Ensures reliable start-up in extreme cold operating conditions.

Cat Planetary Power Shift Transmission
Features heavy duty components to handle the toughest jobs. Electronic controls allow smooth shifting for greater productivity, durability and longer component life.

Impeller Clutch Torque Converter (ICTC)
Electronically controlled impeller clutch torque converter provides maximum flexibility in regulating optimum rimpull in all conditions for smoother operation.

Inching Capability
Left brake pedal operation allows the operator to reduce rimpull to 25% then brake for more precise inching when approaching a truck or making directional changes.

Rimpull Control
Allows operator to adjust maximum rimpull from 100% down to 90, 85, 75 and 65% using a four-position dial while in first gear. Matching rimpull to job conditions provides greater traction in slippery or rough conditions for better performance and longer tire life.

Stable Design
Low mounted heavy-duty power train components ensure a stable machine, for an unequalled payload to full turn static tipping load ratio.

Proven Reliability
The 994D power train has proven itself with the most reliable and durable components in the industry for the lowest operating cost-per-ton.

Torque is developed at the wheel, generating less stress and wear on the axle shafts.

The front axle is fixed, and the rear axle oscillates ±10°, which allows either rear wheel to rise or fall 677 mm (26.7 in) while all wheels remain on the ground for maximum stability, greater traction and a more comfortable ride.

Standard conventional differentials allow one tire to spin faster than the other, keeping developed torque out of the axles.

Axle Shafts
Free-floating axle shafts can be removed independently of the wheels and planetaries for quick and easy servicing.

Permanently lubricated for greater durability and long service life. Only the slipjoint requires manual lubrication.

Oil-Cooled Disc Brakes
Four-wheel, fully hydraulic oil-cooled multiple disc brakes are completely sealed and adjustment free. Two brake pedals allow standard braking with right pedal plus rimpull modulation braking with left pedal.

Brake Cooling
The brake oil cooler provides additional cooling to the brake discs for greater durability.

Screens on the brake circuit minimize the risk of contamination.

Parking/Secondary Brake
Manual, spring-applied, multiple dry-disc brake is located on the front driveline for protection from contamination. Monitoring system alerts operator if transmission is engaged while parking brake is applied, and if the pressure drops, the parking brake is automatically applied.

Engine Cooling
Advanced Modular Cooling System (AMOCS) significantly improves heat rejection through the use of copper cooling cores and an efficient two-pass cooling design.

Final Drives
The all-wheel drive design features four planet carrier gears with planetary double reduction in each wheel for superior reliability. Planetaries can be removed independently of the wheels and brakes for quick and easy servicing.

Duo-Cone® Seals
Seals out dirt and contamination to extend component life.

Designed for maximum strength and durability in the harshest operating environments.


Robust Structures
The 994D front loader frame features robust structural components for outstanding durability in the toughest loading conditions. The frame is the backbone of the 994D's durability and is specifically designed and manufactured to withstand the higher forces required by the machine's increased payload rating.

The box-section rear frame, articulation hitch and four-plate loader tower are designed to resist torsional shocks, twisting forces and stresses generated during the loading cycle while protecting driveline and hydraulic system components.

Lift Arms
The 994D's solid steel lift arms absorb high stresses generated during loading without sacrificing strength or durability. The linkage design provides an excellent view of the bucket edges, corners, and work area, allowing the operator to focus on productivity.

Z-bar Loader Linkage
Proven Z-bar loader linkage geometry delivers maximum productivity. Fewer pivot point and moving parts are designed to reduce maintenance costs.

Cat hydraulics deliver the power and control needed to keep material moving.

Hydraulic System
Completely enclosed hydraulic system uses separate circuits for lift and tilt, steering and brake control. Separate circuits provide increased cooling and elimination of cross-contamination, resulting in less downtime and greater productivity.

Lift and Tilt System
Three dedicated fixed displacement piston pumps deliver high reliability, efficiency and performance to the lift and tilt system.

Pilot Controls
Low-effort, pilot-operated finger-tip controls provide smooth, precise control of lift and tilt functions. Automatic lift kickout and return to dig detents deliver fast cycle times.

Steering System
The 994D features a load-sensing steering system with variable displacement piston pump for smooth, precise control. The revolutionary steering system integrates steering and transmission control functions into a single controller. Simple side-to-side movement of the STIC steer lever turns the machine right or left. Center point frame articulation allows the machine to articulate 40° to the left or right, permitting precise positioning in tight areas.

Filtration System
Advanced filtration system consists of additional screens and filters throughout the lift/tilt, steering and brake systems to maintain cleanliness, and prevent downstream contamination. All are monitored electronically through VIMS to simplify diagnostic troubleshooting and reduce downtime.
  • Lift/tilt high pressure screens
  • Steering high pressure screens
  • Lift/tilt case drain filters
  • Steering case drain filters
  • Hydraulic case drain filters
  • Front pump drive lube filter
  • Front and rear brake oil screens

Cat Hydraulic Hose
Field proven Cat high-pressure XT hydraulic hose is exceptionally strong and flexible for maximum system reliability and long life in the most demanding conditions. Reusable couplings with o-ring face seals provide superior, leak free performance and prolong hose assembly life. Large-bore lift and tilt cylinders round out the hydraulic system, delivering high performance and durability.

Operator's Station
Ergonomically designed for operator comfort, superior control and high productivity.

Operator's Station

Ergonomic Design
The 994D sets the standard for productivity with advanced controls and greater operator comfort. Ergonomic design creates a unique human engineered environment that helps the operator get more work done, all shift long.

1) Steering and Transmission Integrated Control System (STIC)
Combines directional selection, gear selection and steering into a single lever for maximum responsiveness. Simple side-to-side motion turns machine right or left. Transmission shifting (forward/neutral/reverse) is controlled by the operator's fingers, and gear selection is controlled by the thumb. The integrated control system delivers low effort controls for smoother, faster cycles with less operator fatigue.

2) Left Brake Pedal
Operates the Impeller Clutch Torque Converter reducing rimpull to 25%, then engages the brakes for improved control and smoother directional shifts.

3) Contour Series Seat
The air suspension Cat Contour Series Seat with retractable seat belt offers six seat and armrest adjustments for precise positioning and optimum operator comfort. Ergonomic design reduces pressure on the lower back and thighs and allows unrestricted arm and leg movement for greater productivity with less fatigue.

4) Gauge Group
Four separate gauges allow the operator to constantly monitor vital machine systems.
  • Hydraulic oil temperature gauge - Lift and tilt oil - Brake system oil - Steering system oil
  • Transmission oil temperature gauge
  • Coolant temperature gauge - Aftercooler coolant - Engine coolant
  • Engine hour meter

5) Air Conditioner/Heater Controls
A/C system contains environmentally safe R134a refrigerant.

6) Monitoring System
Vital Information Management System (VIMS) electronically monitors and stores diagnostic and performance information in easy-to-read displays for early identification of potential problems and more accurate troubleshooting. The integrated Payload Control System displays and stores vital production information for tracking payloads, loader cycle times and other machine data. The message center displays vital machine information and alerts operator of potential problems. It also stores data that can be easily accessed through the keypad or downloaded to a laptop for quick diagnosis and troubleshooting. A data port allows for wireless transmission of data to the mine office.

7) Bucket and Hoist Controls
Two levers control bucket and lift arm functions.
  • Bucket tilt/curl control - three positions: tilt back, hold, dump.
  • Lift arm hoist control - four positions: raise, hold, lower, float.
Adjustable automatic kickouts for lift and bucket tilt deliver faster cycle times. Automatic bucket positioning returns to desired loading angle.

8) Throttle Lock
Similar to cruise control, throttle lock allows the operator to preset engine speed for specific applications and more effectively concentrate on productivity.

9) Rimpull Control Switch
Activates/ deactives rimpull control system.

10) Rimpull Control Dial
Allows operator to match rimpull settings to job conditions with four-position dial. Operator can adjust maximum rimpull from 100% down to 90, 85, 75 and 65% while in first gear. Matching rimpull to job conditions provides greater traction in slippery or rough conditions for better performance and longer tire life.

11) Torque Converter Lock-Up
Lock-up provides greater efficiency and faster roading capability.

12) Intermittent Wiper Control
Buckets and Ground Engaging Tools
Cat buckets provide the flexibility to match the machine to the material and conditions.

Buckets and Ground Engaging Tools

High Productivity
Aggressive Cat bucket designs deliver unmatched productivity in the most demanding applications. 994D buckets have been redesigned for optimal loadability and structural reliability.

Increased Bucket Capacity Ratings
994D buckets have been slightly modified to allow for a higher capacity rating, which better reflects the actual carrying capacity of the bucket. Physical dimensions have not changed.

Rugged Design
Cat buckets are manufactured using shell-tine construction to resist twisting and distortion. A more aggressive spade edge increases bucket penetration and fill factors and provides better retention of loose material. An integral rock guard helps retain big loads for greater fill factors and optimum truck loading.

Spade Edge Rock Buckets
Spade edge rock buckets with bolt-on segments are designed to penetrate through the pile while leaving a smooth work floor. Shouldered, double-strap adapters allow easy change-out and bolt-on segments extend base edge life.

Bucket Protection
Cat Ground Engaging Tools (G.E.T.) provide superior bucket protection for long life in the most punishing conditions. Built to absorb shock, impact, and abrasion, G.E.T. work and wear as a system to boost productivity and lower costs.

Tips extend bucket life in high wear applications.

Sidebar Protectors
Protects bucket corner and sides from wear in abrasive materials. Pin-on sidebars are reversible to extend wear life.

Edge Protectors
Protects bucket edge from wear in materials with high wear rates. Independently pinned for easy replacement without removing tips or adapters.

Wear Plates
Replaceable wear plates protect the bucket bottom. Bolt-on and weld-on wear plates protect the rear base edge from damage.

Mechanically Attached Adapter System (MAA)
Designed for high wear applications, this system offers full protection for the bucket wear edge while featuring fast removal and installation (top-pinned tips require less time to change than side-pinned tips).

MAA Corner Adapters
Increases overall bucket width by 76-102 mm (3-4 in) without changing bucket capacity.

MAA Wear Indicator
Built-in wear indicator provides a visual indication of when center adapters need replaced.

Less time spent on maintenance means more time on the job.


Easy Servicing
The 994D is designed for quick, easy servicing. Simplified access to service areas allows for quick servicing and ensures routine maintenance procedures are performed on time.

Ground-Level Access
Ground-level access to centralized lubrication points makes lube service quick and easy.

Air Cleaners
Dry-type air cleaners with primary and secondary elements, automatic dust ejector, and service indicator are positioned above the hood for easy access.

Pressure Test Ports
Hydraulic pressure test ports enable fast troubleshooting of major hydraulic circuits.

Cooling System
Two-pass Advanced Modular Cooling System (AMOCS) has modular design with removable cores for easy replacement and maintenance.

On-Board Diagnostics
Diagnostic connector allows quick troubleshooting of starting and charging functions.

Monitoring System
VIMS notifies operator and service technicians of problems before failure and identifies location to minimize troubleshooting and reduce downtime. Features:
  • Three-level warning system
  • Data recording system
  • Payload Control System
  • Off-board analysis system

Standard automatic lubrication system reduces maintenance time by automatically lubricating bearings in:
  • lift and tilt cylinders
  • upper and middle bucket tilt levers
  • bucket pins
  • steering cylinders
  • rear axle trunnions
  • fan drive and belt tightening pulleys
  • upper and lower articulation hitch
Lubrication timing and duration can be easily set using the VIMS keypad.

Wiggins Service Center
Reduces maintenance time by centralizing fast fill connections and providing ground-level service access for:
  • lift and tilt oil
  • steering oil
  • steering/brake actuator oil
  • brake oil
  • engine oil
  • engine coolant
  • transmission oil
  • autolube
  • air tank

Customer Support
Caterpillar dealers have what it takes to keep mining machines productive.

Machine Selection
Make detailed comparisons of the machines you are considering before you buy.

Look past initial price. Consider the financing options available, as well as day-to-day operating costs. This is also the time to look at dealer services that can be included in the cost of the machine to lower equipment owning and operating costs over the long run.

Your dealer is expert at arranging affordable financing options for all Caterpillar products.

Customer Support Agreements
Cat dealers offer a variety of product support agreements, and work with customers to develop a plan that meets specific needs. These plans can cover the entire machine, including work tools, to help protect your investments.

Product Support
You will find nearly all parts at your dealer parts counter. Cat dealers use a worldwide computer network to find in-stock parts to minimize machine downtime. Cat reman parts offer the same warranty and reliability as new products at cost savings of 40 to 70 percent.

Improving operating techniques can boost your profits. Your Cat dealer has training videotapes, literature, and equipment training courses to help you increase productivity.

Maintenance Services
Choose from your dealer's range of maintenance services when you purchase your machine. Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as S•O•SSM coolant sampling and technical analysis help you avoid unscheduled repairs.

Repair, rebuild or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.

For more complete information on Cat products, dealer services, and industry solutions, visit us on the web at www.CAT.com.

Matched Systems
An efficient loading/hauling system starts with a perfect match.

Matched Systems

Efficient Combination
For full truck payloads with minimum loading time, an efficient loading/hauling system starts with a perfect match. Cat Wheel Loaders are matched with Cat C-Series Mining Trucks to maximize volume of material moved at the lowest operating cost-per-ton.

Application Match
The standard 994D is sized to load the 150-ton 785C in four passes. The 994D high-lift loads the 195-ton 789C in six passes and the 240-ton 793C in seven passes.

Bucket Selection
Selection of the right bucket width depends on penetration requirements and the loading target. Bucket sizes are matched to truck bed capacities for optimum loading efficiency and greater productivity.

Narrow Bucket
The narrower 5650 mm (222 in) buckets are optimally matched to load the Cat 785C, and are also sized for the 789C.

Wide Bucket
The wider 6220 mm (245 in) buckets are optimally matched to load the larger Cat 789C, and are also sized for the 793C.

Standard Equipment

  • Alarm, back-up
  • Alternator, 100 amp
  • Batteries, dry
  • Converter, 15 amp, 24V to 12V
  • Diagnostic connector
  • Lights, halogen, working; access/service platform lights
  • Starting and charging system, 24V
  • Air conditioner
  • Cab, sound suppressed and pressurized
  • Cab, external rollover protective structure, ROPS/FOPS
  • Cab, cleanout hose
  • Cigar lighter, ashtray
  • Coat hook
  • Controls, lift and tilt function
  • Heater, defroster
  • Horn, electric
  • Instrumentation, gauges
  • Light, cab, dome
  • Lunchbox, beverage holders
  • Mirrors, rearview, externally mounted
  • Rimpull Control System
  • Seat, Cat Contour, air suspension, six-way adjustable, cloth
  • Seat belt, retractable, 76 mm (3 in) wide
  • STIC Control System
  • Tinted glass
  • Transmission gear indicator
  • Vital Information Management System (VIMS)
  • Wipers/washers, intermittent, front/rear
  • Brakes, oil-cooled, multi-disc, service/secondary
  • Driveline parking brake
  • Engine, 3516B EUI Diesel, turbocharged, aftercooled
  • Fuel priming pump
  • Guard, transmission/torque converter
  • Ground level engine shutoff
  • Precleaner, engine air intake (above hood)
  • Radiator, Advanced Modular Cooling System (AMOCS)
  • Rims, factory installed
  • Starting aid, ether, automatic
  • Throttle lock, electronic
  • Torque converter, impeller clutch (ICTC), lockup clutch
  • Transmission, planetary powershift, 3F/3R electronic control
  • Air tank, ECC compliant (EN286)
  • Air line dryer
  • Antifreeze, premixed, 50% concentration extended life coolant w/ freeze protection to -50° C (-58° F)
  • Automatic bucket lift kickout
  • Automatic bucket positioner
  • Automatic lubrication system, fast fill, Wiggins
  • Blower fan
  • Doors, service access, locking
  • Ecology drains
  • Engine oil change system, high speed, Wiggins
  • Fast fill fuel system, Wiggins
  • Fuel tank, 4641 L (1226 gal)
  • Hitch, drawbar, pin
  • Hydraulic system
  • Mufflers
  • Oil sampling valves
  • Rear access, cab, service platform
  • Supplemental steering system
  • Wiggins Service Center
  • Vandalism protection, caplocks



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