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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.
| Net Power | 541 HP |
| Engine Model | Cat® C18 ™ |
| Bore | 5.7 in |
| Stroke | 7.2 in |
| Displacement | 1105 in³ |
| Torque Rise | 58 % |
| Rated Speed | 1700/min |
| Peak Torque - 1,200 rpm | 2104 lb/ft |
| Net Power - SAE J1349 | 541 HP |
| Peak Power Speed | 1500/min |
| Peak Power Speed - 1,500 rpm - Gross - ISO 14396 | 580 HP |
| Gross - ISO 14396 | 580 HP |
| Peak Power Speed - 1,500 rpm - Gross - SAE J1995 | 588 HP |
| Emissions | U.S. EPA Tier 4 Final/EU Stage V OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent |
| Peak Power Speed - 1,500 rpm - Net Power - SAE J1349 | 541 HP |
| Operating Weight | 112574 lb |
| Bucket Capacity Range | 4.7-13 m3 (6.2-17 yd3) |
| Rated Payload - Quarry Face | 12.5 t |
| Cat Truck Match - High Lift | 773～775 |
| Rated Payload - Loose Material | 16 t |
| Cat Truck Match - Standard | 770～772 |
| Transmission Type | Cat-Planetenlastschaltgetriebe |
| Forward - 1 | 4 mile/h |
| Forward - 2 | 7.2 mile/h |
| Forward - 3 | 12.7 mile/h |
| Forward - 4 | 21.6 mile/h |
| Reverse - 1 | 4.7 mile/h |
| Reverse - 2 | 8.3 mile/h |
| Reverse - 3 | 14.4 mile/h |
| Direct Drive - Reverse 2 | 8.9 mile/h |
| Direct Drive - Reverse 3 | 15.8 mile/h |
| Direct Drive - Forward 2 | 7.8 mile/h |
| Direct Drive - Reverse 1 | 5 mile/h |
| Direct Drive - Forward 1 | Lock-up disabled |
| Direct Drive - Forward 3 | 13.9 mile/h |
| Direct Drive - Forward 4 | 24.4 mile/h |
| Maximum Flow | 13.7 gal/min |
| Maximum Flow at 1,400-1,860 rpm | 153 gal/min |
| Lift/Tilt System | Variable displacement piston |
| Cylinders, Double Acting - Tilt, Bore and Stroke | 269 mm × 685 mm (8.7 in × 27 in) |
| Relief Valve Setting - Main | 551 psi |
| Relief Valve Setting - Lift/Tilt | 4757 psi |
| Pilot System | Variable displacement piston |
| Cylinders, Double Acting - Lift, Bore and Stroke | 210 mm × 1050 mm (8.7 in × 41.3 in) |
| Lift/Tilt System - Circuit | EH- Positive Flow Control, Flow Sharing |
| Fuel Tank | 188 gal (US) |
| Cooling System | 31.7 gal (US) |
| Crankcase | 15.9 gal (US) |
| Transmission | 31.7 gal (US) |
| Hydraulic System - Tank Only | 63.4 gal (US) |
| Differential - Final Drives - Rear | 49.1 gal (US) |
| Hydraulic System Factory Fill | 125.5 gal (US) |
| Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage IV Only) | 8.7 gal (US) |
| Differential - Final Drives - Front | 49.1 gal (US) |
| Coolant (Validated by Test Cell Fill Quantities) | 33 gal (US) |
| Transmission - Validated by Test Cell Fill Quantities | 29 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 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 s |
| Lower Float Down | 3.5 s |
| Rack Back | 4.5 s |
| Raise | 8 s |
| Dump | 2.2 s |
| Operator Sound Level (ISO 6396) | 72 dB(A) |
| Machine Sound Level (ISO 6395) | 111 dB(A) |
| Machine Sound Level (ISO 6395) | 109 dB(A) |
| Operator Sound Level (ISO 6396) | 72 dB(A) |
| Operator Sound Level (ISO 6396) | 72 dB(A) |
| Machine Sound Level (ISO 6395) | 110 dB(A) |
| Machine Sound Level (ISO 6395) | 112 dB(A) |
| Operator Sound Level ( ISO 6396) | 73 dB(A) |
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