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