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 | 541HP |
| Engine Model | Cat® C18 ™ |
| Net Power - SAE J1349 | 541HP |
| Bore | 5.7in |
| Stroke | 7.2in |
| Displacement | 1105in³ |
| Torque Rise | 58% |
| Rated Speed | 1700/min |
| Peak Power Speed - 1,500 rpm - Gross - ISO 14396 | 580HP |
| Gross - ISO 14396 | 580HP |
| Peak Power Speed | 1500/min |
| Peak Power Speed - 1,500 rpm - Gross - SAE J1995 | 588HP |
| Peak Torque - 1,200 rpm | 2104lb/ft |
| Peak Power Speed - 1,500 rpm - Net Power - SAE J1349 | 541HP |
| Emissions | Einhaltung von EPA Tier 4 Final (USA)/Stufe V (EU), Tier-2-konform |
| Operating Weight | 112574lb |
| Rated Payload | 12.5t |
| Rated Payload - Standard | 12.5t |
| Bucket Capacity Range | 6.4-7.6 m3 (8.3-10 yd3) |
| Cat Truck Match - Standard | 770-772 |
| Cat Truck Match - High Lift | 773-775 |
| Rated Payload - High Lift | 12.5t |
| Bucket Capacities | 5.4-6.3 m3 (7.0-8.3 yd3) |
| Transmission Type | Cat-Planetenlastschaltgetriebe |
| Forward - 1 | 4mile/h |
| Forward - 2 | 7.2mile/h |
| Forward - 3 | 12.7mile/h |
| Forward - 4 | 21.6mile/h |
| Reverse - 1 | 4.7mile/h |
| Reverse - 2 | 8.3mile/h |
| Reverse - 3 | 14.4mile/h |
| Direct Drive - Forward 1 | Lock-up disabled |
| Direct Drive - Forward 2 | 7.8mile/h |
| Direct Drive - Forward 3 | 13.9mile/h |
| Direct Drive - Forward 4 | 24.4mile/h |
| Direct Drive - Reverse 1 | 5mile/h |
| Direct Drive - Reverse 2 | 8.9mile/h |
| Direct Drive - Reverse 3 | 15.8mile/h |
| Front | Fixed |
| Rear | Trunnion |
| Oscillation Angle | ±6° |
| Steering System - Circuit | Pilot, load sensing |
| Steering System - Pump | Piston, variable displacement |
| Relief Valve Setting - Steering | 4351psi |
| Maximum Flow | 71.3gal/min |
| Steering Cycle Times - Low Idle | 5.6s |
| Total Steering Angle | 80° |
| Steering Cycle Times - High Idle | 3.4s |
| Fuel Tank | 181gal (US) |
| Cooling System | 31.7gal (US) |
| Crankcase | 15.9gal (US) |
| Transmission | 31.7gal (US) |
| Differential - Final Drives - Front | 49.1gal (US) |
| Differential - Final Drives - Rear | 49.1gal (US) |
| Hydraulic System - Tank Only | 63.4gal (US) |
| Diesel Exhaust Fluid Tank (Tier 4) | 8.7gal (US) |
| Hydraulic System Factory Fill | 125.5gal (US) |
| Pilot System | Variable displacement piston |
| Relief Valve Setting - Main | 551psi |
| Maximum Flow | 13.7gal/min |
| Cylinders, Double Acting - Tilt, Bore and Stroke | 267 mm × 685 mm (10.5 in × 27.0 in) |
| Maximum Flow at 1,400-1,860 rpm | 153gal/min |
| Cylinders, Double Acting - Lift, Bore and Stroke | 210 mm × 1050 mm (8.3 in × 41.3 in) |
| Lift/Tilt System | Variable displacement piston |
| Lift/Tilt System - Circuit | EH- Positive Flow Control, Flow Sharing |
| Relief Valve Setting - Lift/Tilt | 4757psi |
| Rack Back | 4.5s |
| Lower Float Down | 3.5s |
| Raise | 8s |
| Total Hydraulic Cycle Time - Empty Bucket | 18.2s |
| Dump | 2.2s |
| Operator Sound Level (ISO 6396) | 71dB(A) |
| Machine Sound Level (ISO 6395) | 111dB(A) |
| Operator Sound Level (ISO 6396) | 70dB(A) |
| Machine Sound Level (ISO 6395) | 109dB(A) |
| Brakes | SAE J1473 OKT90, ISO 3450:1992 |
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988K Wheel Loader Steel Mill Arrangement