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Caterpillar - 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.

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Brochure / Documentation - C818887

Net Power 541.0 hp
Engine Model Cat® C18 ™
Bore 5.7 in
Stroke 7.2 in
Displacement 1105.0 in3
Torque Rise 58.0 %
Rated Speed 1700/min
Peak Torque @ 1,200 rpm 2104.0 lb ft
Net Power – SAE J1349 541.0 hp
Peak Power Speed 1500/min
Peak Power Speed @ 1,500 rpm: Gross - ISO 14396 580.0 hp
Gross (ISO 14396) 580.0 hp
Peak Power Speed @ 1,500 rpm: Gross - SAE J1995 588.0 hp
Emissions U.S. EPA Tier 4 Final/EU Stage IV OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent
Peak Power Speed @ 1,500 rpm: Net Power - SAE J1349 541.0 hp
Operating Weight 112574.0 lb
Bucket Capacity Range 4.7-13 m3 (6.2-17 yd3)
Rated Payload - Standard (Quarry Face) 12.5 tons
Cat Truck Match - High Lift 773~775
Rated Payload - Loose Material 16.0 t
Cat Truck Match - Standard 770~772
Transmission - type Cat-Planetenlastschaltgetriebe
Forward 1 4.0 mph
Forward 2 7.2 mph
Forward 3 12.7 mph
Forward 4 21.6 mph
Reverse 1 4.7 mph
Reverse 2 8.3 mph
Reverse 3 14.4 mph
Direct Drive - Reverse 2 8.9 mile/h
Direct Drive - Reverse 3 15.8 mph
Direct Drive - Forward 2 7.8 mile/h
Direct Drive - Reverse 1 5.0 mile/h
Direct Drive - Forward 1 Lock-up disabled
Direct Drive - Forward 3 13.9 mph
Direct Drive - Forward 4 24.4 mph
Maximum Flow 13.7 gal/min
Maximum Flow at 1,400-1,860 rpm 153.0 gal/min
Lift/Tilt System Variable displacement piston
Lift/Tilt System - Pump 269 mm × 685 mm (8.7 in × 27 in)
Relief Valve Setting 551.0 psi
Tilt Cylinder - Stroke* 4757.0 in
Max Flow at 1,710 rpm (3x) gal/min
Lift/Tilt System - Circuit 210 mm × 1050 mm (8.7 in × 41.3 in)
Lift Cylinder - Bore* in
Fuel Tank 188.0 gal
Cooling System 31.7 gal
Crankcase 15.9 gal
Transmission 31.7 gal
Hydraulic System - Tank Only 63.4 gal (US)
Differential - Final Drives - Rear 49.1 gal (US)
Hydraulic System Factory Fill 125.5 gal
Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage IV Only) 8.7 gal (US)
Differential - Final Drives - Front 49.1 gal (US)
Bucket Capacities 4.7-13 m3 (6.2-17 yd3)
Front Fixed
Rear Trunnion
Oscillation Angle 13 °
Brakes SAE J1473 OKT90, ISO 3450:1992
Steering System - Pump Piston, variable displacement
Total Steering Angle 86 °
Maximum Flow 71.3 gal/min
Relief Valve Setting - Steering 4351.0 psi
Steering Cycle Times - High Idle 3.4 s
Steering System - Circuit Pilot, load sensing
Steering Cycle Times - Low Idle 5.6 s
Total Hydraulic Cycle Time (empty bucket) 18.2 Seconds
Lower Float Down 3.5 Seconds
Rackback 4.5 Seconds
Raise 8.0 Seconds
Dump 2.2 Seconds
Operator Sound Level (ISO 6396) 72.0 dB(A)
Machine Sound Level (ISO 6395) 111.0 dB(A)
Machine Sound Level (ISO 6395) 109.0 dB(A)
Operator Sound Level (ISO 6396) 72.0 dB(A)
Operator Sound Level (ISO 6396) 72.0 dB(A)
Machine Sound Level (ISO 6395) 112.0 dB(A)
Machine Sound Level (ISO 6395) 110.0 dB(A)
Coolant (Validated by Test Cell Fill Quantities) 33.0 gal (US)
Transmission - Validated by Test Cell Fill Quantities 29.0 gal (US)
Operator Sound Level ( ISO 6396) 73.0 dB(A)