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988K Wheel Loader

Cat® Large Wheel Loaders are designed with durability built in, ensuring maximum availability through multiple life cycles. With optimized performance and simplified serviceability, our machines allow you to move more material efficiently and safely at a lower cost per ton. Introduced in 1963, the 988 has been the industry leader for 50 years. Focused on helping our customers succeed, we have continued to build upon each new series. The 988K continues our legacy of reliability, performance, safety, operator comfort, serviceability, and efficiency.

Operating Weight 51062 kg
Bucket Capacity Range 4.7-13 m3 (6.2-17 yd3)
Cat Truck Match - Standard 770~772
Cat Truck Match - High Lift 773~775
Rated Payload - Loose Material 14.5 t
Rated Payload - Quarry Face 11.3 t

Bucket Capacities 4.7-13 m3 (6.2-17 yd3)

Net Power 403 kW
Engine Model Cat® C18 ™
Rated Speed 1700/min
Peak Power Speed 1500/min
Torque Rise 58 %
Bore 145 mm
Stroke 183 mm
Displacement 18.1 l
Emissions U.S. EPA Tier 4 Final/EU Stage V OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent
Gross - ISO 14396 432 kW
Net Power - SAE J1349 403 kW
Peak Power Speed - 1,500 rpm - Gross - ISO 14396 432 kW
Peak Power Speed - 1,500 rpm - Gross - SAE J1995 439 kW
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349 403 kW
Peak Torque - 1,200 rpm 2852 N·m

Forward - 1 6.5 km/h
Forward - 2 11.6 km/h
Forward - 3 20.4 km/h
Forward - 4 34.7 km/h
Reverse - 1 7.5 km/h
Reverse - 2 13.3 km/h
Reverse - 3 23.2 km/h
Direct Drive - Forward 4 39.3 km/h
Direct Drive - Forward 1 Lock-up disabled
Direct Drive - Forward 2 12.5 km/h
Direct Drive - Forward 3 22.3 km/h
Direct Drive - Reverse 1 8 km/h
Direct Drive - Reverse 2 14.3 km/h
Direct Drive - Reverse 3 25.5 km/h
Transmission Type Cat-Planetenlastschaltgetriebe

Front Fixed
Oscillation Angle 13 °
Rear Trunnion

Lift/Tilt System - Circuit EH- Positive Flow Control, Flow Sharing
Lift/Tilt System Variable displacement piston
Relief Valve Setting - Lift/Tilt 32800 kPa
Pilot System Variable displacement piston
Cylinders, Double Acting - Lift, Bore and Stroke 210 mm × 1050 mm (8.7 in × 41.3 in)
Cylinders, Double Acting - Tilt, Bore and Stroke 269 mm × 685 mm (8.7 in × 27 in)
Maximum Flow 52 l/min
Maximum Flow at 1,400-1,860 rpm 580 l/min
Relief Valve Setting - Main 3800 kPa

Relief Valve Setting - Steering 30000 kPa
Total Steering Angle 86 °
Steering Cycle Times - High Idle 3.4 s
Steering Cycle Times - Low Idle 5.6 s
Maximum Flow 270 l/min
Steering System - Circuit Pilot, load sensing
Steering System - Pump Piston, variable displacement

Fuel Tank 712 l
Cooling System 120 l
Transmission 120 l
Differential - Final Drives - Front 186 l
Differential - Final Drives - Rear 186 l
Hydraulic System - Tank Only 240 l
Coolant (Validated by Test Cell Fill Quantities) 125 l
Crankcase 60 l
Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage IV Only) 33 l
Hydraulic System Factory Fill 475 l
Transmission - Validated by Test Cell Fill Quantities 110 l

Brakes SAE J1473 OKT90, ISO 3450:1992

Dump 2.2 s
Lower Float Down 3.5 s
Rack Back 4.5 s
Raise 8 s
Total Hydraulic Cycle Time - Empty Bucket 18.2 s

Machine Sound Level (ISO 6395) 112 dB(A)
Operator Sound Level (ISO 6396) 73 dB(A)

Machine Sound Level (ISO 6395) 110 dB(A)
Operator Sound Level (ISO 6396) 72 dB(A)

Machine Sound Level (ISO 6395) 111 dB(A)
Operator Sound Level (ISO 6396) 72 dB(A)

Machine Sound Level (ISO 6395) 109 dB(A)
Operator Sound Level (ISO 6396) 72 dB(A)

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