Large Wheel Loaders
Cat 988K
Operating Weight
51t
Power
432kW (580hp)
Reach
2,074mm

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.
Specifications
Operating Weight
51t
Power
432kW (580hp)
Reach
2,074mm
Payload
12.5t
Bucket Capacity
13m³
Specifications
Engine
Bore
145mm
Displacement
18.1l
Emissions
U.S. EPA Tier 4 Final/EU Stage V OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent
Engine Model
Cat® C18 ™
Gross - ISO 14396
432kW
Net Power
403kW
Net Power - SAE J1349
403kW
Peak Power Speed
1500/min
Peak Power Speed - 1,500 rpm - Gross - ISO 14396
432kW
Peak Power Speed - 1,500 rpm - Gross - SAE J1995
439kW
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349
403kW
Peak Torque - 1,200 rpm
2852N·m
Rated Speed
1700/min
Stroke
183mm
Torque Rise
58%
Operating Specifications
Bucket Capacity Range
4.7-13 m3 (6.2-17 yd3)
Cat Truck Match - High Lift
773~775
Cat Truck Match - Standard
770~772
Operating Weight
51062kg
Rated Payload - Loose Material
14.5t
Rated Payload - Quarry Face
11.3t
Transmission
Direct Drive - Forward 1
Lock-up disabled
Direct Drive - Forward 2
12.5km/h
Direct Drive - Forward 3
22.3km/h
Direct Drive - Forward 4
39.3km/h
Direct Drive - Reverse 1
8km/h
Direct Drive - Reverse 2
14.3km/h
Direct Drive - Reverse 3
25.5km/h
Forward - 1
6.5km/h
Forward - 2
11.6km/h
Forward - 3
20.4km/h
Forward - 4
34.7km/h
Reverse - 1
7.5km/h
Reverse - 2
13.3km/h
Reverse - 3
23.2km/h
Transmission Type
Cat-Planetenlastschaltgetriebe
Hydraulic System - Lift/Tilt
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)
Lift/Tilt System
Variable displacement piston
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing
Maximum Flow
52l/min
Maximum Flow at 1,400-1,860 rpm
580l/min
Pilot System
Variable displacement piston
Relief Valve Setting - Lift/Tilt
32800kPa
Relief Valve Setting - Main
3800kPa
Service Refill Capacities
Coolant (Validated by Test Cell Fill Quantities)
125l
Cooling System
120l
Crankcase
60l
Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage IV Only)
33l
Differential - Final Drives - Front
186l
Differential - Final Drives - Rear
186l
Fuel Tank
712l
Hydraulic System - Tank Only
240l
Hydraulic System Factory Fill
475l
Transmission
120l
Transmission - Validated by Test Cell Fill Quantities
110l
Buckets
Bucket Capacities
4.7-13 m3 (6.2-17 yd3)
Axles
Front
Fixed
Oscillation Angle
13 °
Rear
Trunnion
Brakes
Brakes
SAE J1473 OKT90, ISO 3450:1992
Hydraulic System - Steering
Maximum Flow
270l/min
Relief Valve Setting - Steering
30000kPa
Steering Cycle Times - High Idle
3.4s
Steering Cycle Times - Low Idle
5.6s
Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement
Total Steering Angle
86 °
Hydraulic Cycle Time (1,400-1,860 rpm)
Dump
2.2s
Lower Float Down
3.5s
Rack Back
4.5s
Raise
8s
Total Hydraulic Cycle Time - Empty Bucket
18.2s
Sound Performance - Tier 4 Final/Stage IV - Standard
Machine Sound Level (ISO 6395)
111dB(A)
Operator Sound Level (ISO 6396)
72dB(A)
Sound Performance - Tier 4 Final/Stage IV: Suppression
Machine Sound Level (ISO 6395)
109dB(A)
Operator Sound Level (ISO 6396)
72dB(A)
Sound Performance - Tier 2 Equivalent/Stage II: Standard
Machine Sound Level (ISO 6395)
112dB(A)
Operator Sound Level ( ISO 6396)
73dB(A)
Sound Performance - Tier 2 Equivalent/Stage II: Suppression
Machine Sound Level (ISO 6395)
110dB(A)
Operator Sound Level (ISO 6396)
72dB(A)
GALLERY

How does the 988K Compare?
-
Wheel Loaders Cat 988K
Operating Weight51tPower432kW (580hp)Reach2,074mmSELECTED MODEL -
Wheel Loaders Cat 986K
Operating Weight44.8tPower335kW (449hp)Reach2,175mm -
Wheel Loaders Cat 990K
Operating Weight80.9tPower561kW (752hp)Reach2,194mm