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Large Wheel Loaders
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 low cost per ton. Introduced in 1963, the 988 has been an industry leader for 60 years. Focused on helping our customers succeed, we have continued to build upon each new series. The 988 continues our legacy of reliability, performance, safety, operator comfort, serviceability, and efficiency.
Engine Power - ISO 14396:2002
580 hp/432 kW
Engine Model
Cat® C18
Rated Speed
1700/rpm
Peak Power Speed
1500/rpm
Key Features
PROVEN RELIABILITY
LONG TERM VALUE AND DURABILITY
PERFORMANCE AND PRODUCTIVITY
PERFORMANCE WITH LESS FUEL
PRODUCTIVITY WITH TECHNOLOGY
SAFETY FIRST
SAVE ON SERVICE AND MAINTENANCE
OPERATOR COMFORT AND CONTROL
PURPOSE-BUILT SPECIALTY MODELS - BLOCK HANDLER
PURPOSE-BUILT SPECIALTY MODELS - MILLYARD
PURPOSE-BUILT SPECIALTY MODELS - STEEL MILL
Specifications
Metric
|
Imperial
Engine 
Engine Power - ISO 14396:2002
580 hp
432 kW
Engine Model
Cat® C18
Rated Speed
1700/rpm
Peak Power Speed
1500/rpm
Gross Power - SAE J1995:2014
588 hp
439 kW
Net Power - SAE J1349:2011
538 hp
401 kW
Bore
5.7 in
145 mm
Stroke
7.2 in
183 mm
Displacement
1105 in³
18.1 l
Peak Torque - 1,200 rpm
2104 lbf·ft
2852 N·m
Torque Rise
58 %
58 %
Note (1)
Three engine emission options are available: 1. Meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards. 2. Meets Brazil MAR-1 emission standards, equivalent to U.S. EPA Tier 3 and EU Stage IIIA. 3. Meets China Nonroad Stage IV emission standards.
Note (2)
Net power advertised is the power available at the flywheel when the engine is equipped with fan at minimum speed, air intake system, exhaust system, and alternator.
Operating Specifications
Operating Weight
112,574 lb
51062 kg
Bucket Capacity Range
4.7-13 m3 (6.2-17 yd3)
Rated Payload - Quarry Face
12.5 t
11.3 t
Rated Payload - Loose Material
16 t
14.5 t
Cat Truck Match - Standard
770 - 772
Cat Truck Match - High Lift
773 - 775
Transmission
Transmission Type
Cat planetary powershift
Forward - 1
4.0 mile/h
6.5 km/h
Forward - 2
7.2 mile/h
11.6 km/h
Forward - 3
12.7 mile/h
20.4 km/h
Forward - 4
21.6 mile/h
34.7 km/h
Reverse - 1
4.7 mile/h
7.5 km/h
Reverse - 2
8.3 mile/h
13.3 km/h
Reverse - 3
14.4 mile/h
23.2 km/h
Direct Drive - Forward 1
Lock-up disabled
Direct Drive - Forward 2
7.8 mile/h
12.5 km/h
Direct Drive - Forward 3
13.9 mile/h
22.3 km/h
Direct Drive - Forward 4
24.4 mile/h
39.3 km/h
Direct Drive - Reverse 1
5.0 mile/h
8.0 km/h
Direct Drive - Reverse 2
8.9 mile/h
14.3 km/h
Direct Drive - Reverse 3
15.8 mile/h
25.5 km/h
Hydraulic System - Lift/Tilt
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing
Lift/Tilt System - Pump
Variable displacement piston
Maximum Flow at 1,400-1,860 rpm
153 gpm
580 L/min
Relief Valve Setting - Lift/Tilt
4757 psi
32800 kPa
Cylinders, Double Acting - Lift, Bore and Stroke
210 mm × 1050 mm (8.7 in × 41.3 in)
Cylinders, Double Acting - Tilt, Bore and Stroke
266 mm × 685 mm (8.7 in × 27 in)
Pilot System
Variable displacement piston
Relief Valve Setting - Main
551 psi
3800 kPa
Hydraulic Cycle Time (1,400-1,860 rpm)
Rack Back
4.5 s
4.5 s
Raise
8.0 s
8.0 s
Dump
2.2 s
2.2 s
Lower Float Down
3.5 s
3.5 s
Total Hydraulic Cycle Time - Empty Bucket
18.2 s
18.2 s
Hydraulic System - Steering
Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement
Maximum Flow at 1,400-1,600 rpm
71.3 gpm
270 L/min
Relief Valve Setting - Steering
4351 psi
30000 kPa
Total Steering Angle
86 °
Steering Cycle Times - High Idle
3.4 s
3.4 s
Steering Cycle Times - Low Idle
5.6 s
5.6 s
Air Conditioning System
Air Conditioning
• The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a or R1234yf. See the label or instruction manual for identification of the gas. • If equipped with R134a (Global Warming Potential = 1430), the system contains 1.8 kg (3.9 lb) of refrigerant which has a CO2 equivalent of 2.574 metric tonnes (2.837 tons).
Axles
Front
Fixed
Rear
Trunnion
Oscillation Angle
13 °
Brakes
Brakes
ISO 3450:2011
Operator's Cab
ROPS/FOPS
ROPS/FOPS meet ISO 3471:2008 and ISO 3449:2005 Level II standards
Sound Performance - Tier 4 Final / Stage V
Operator Sound Pressure Level (ISO 6396:2008)
73 dB(A)
73 dB(A)
Machine Sound Power Level (ISO 6395:2008)
111 dB(A)
111 dB(A)
Operator Sound Pressure Level (ISO 6396:2008)*
72 dB(A)
72 dB(A)
Machine Sound Power Level (ISO 6395:2008)**
109 dB(A)
109 dB(A)
Note (1)
* For machines in European Union countries and in countries that adopt the “EU Directives” and “UK Directives.”
Note (2)
** European Union Directive “2000/14/EC” as amended by “2005/88/EC” and UK Noise Regulation 2001 No. 1701.
Note (3)
The machine sound power level was measured according to ISO 6395:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed.
Note (4)
The operator sound pressure level was measured according to ISO 6396:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed.
Note (5)
Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment.
Sound Performance - Tier 3 / Stage IIIA
Operator Sound Pressure Level (ISO 6396:2008)
73 dB(A)
73 dB(A)
Machine Sound Power Level (ISO 6395:2008)
112 dB(A)
112 dB(A)
Operator Sound Pressure Level (ISO 6396:2008)*
72 dB(A)
72 dB(A)
Machine Sound Power Level (ISO 6395:2008)**
110 dB(A)
110 dB(A)
Note (1)
* For machines in European Union countries and in countries that adopt the “EU Directives” and “UK Directives.”
Note (2)
** European Union Directive “2000/14/EC” as amended by “2005/88/EC” and UK Noise Regulation 2001 No. 1701.
Note (3)
The machine sound power level was measured according to ISO 6395:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed.
Note (4)
The operator sound pressure level was measured according to ISO 6396:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed.
Note (5)
Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment.
Service Refill Capacities
Fuel Tank
188 gal (US)
712 l
Cooling System
31.7 gal (US)
120 l
Coolant (Validated by Test Cell Fill Quantities)
33 gal (US)
125 l
Crankcase
15.9 gal (US)
60 l
Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage V Only)
8.7 gal (US)
33 l
Transmission
24.3 gal (US)
92 l
Transmission - Validated by Test Cell Fill Quantities
29 gal (US)
110 l
Differential - Final Drives - Front
49.1 gal (US)
186 l
Differential - Final Drives - Rear
49.1 gal (US)
186 l
Hydraulic System Factory Fill
125.5 gal (US)
475 l
Hydraulic System - Tank Only
63.4 gal (US)
240 l
Note
• All non-road Tier 4 Final/Stage V diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) or ULSD blended with the following lower-carbon intensity fuels** up to: – 20% biodiesel FAME (fatty acid methyl ester)* – 100% renewable diesel, HVO (hydrotreated vegetable oil) and GTL (gas-to-liquid) fuels. Refer to guidelines for successful application. Please consult your Cat dealer or “Caterpillar Machine Fluids Recommendations” (SEBU6250) for details. • Engines with no aftertreatment devices can use higher blends, up to 100% biodiesel (for use of blends higher than 20% biodiesel, consult your Cat dealer).** • For pre-Tier 4 engines: Cat engines are compatible with diesel fuel blended with the following lower-carbon intensity fuels** up to: – 100% biodiesel FAME (fatty acid methyl ester)* – 100% renewable diesel, HVO (hydrotreated vegetable oil) and GTL (gas-to-liquid) fuels. Refer to guidelines for successful application. Please consult your Cat dealer or “Caterpillar Machine Fluids Recommendations” (SEBU6250) for details. * For use of blends higher than 20% biodiesel, consult your Cat dealer. ** Tailpipe greenhouse gas emissions from lower-carbon intensity fuels are essentially the same as traditional fuels.
Dimensions (Approximate) - Standard Lift Linkage
Ground to Top of ROPS
13.8 ft
4202 mm
Ground to Top of Exhaust Stacks
14.8 ft
4521 mm
Ground to Top of Hood
10.9 ft
3334 mm
Rear Axle - Centerline to Bumper
10.5 ft
3187 mm
Front Axle Centerline to Bucket Tip
14 ft
4254 mm
Wheel Base
14.9 ft
4550 mm
Maximum Overall Length
39.3 ft
11991 mm
Ground to Lower Hitch Clearance
1.9 ft
568 mm
Clearance at Maximum Lift
11.9 ft
3641 mm
B-Pin Height - Maximum Lift
18.0 ft
5485 mm
Maximum Overall Height - Bucket Raised
24.5 ft
7455 mm
Reach - Maximum Lift
6.5 ft
1981 mm
Dimensions (Approximate) - High Lift Linkage
Ground to Top of ROPS
13.8 ft
4202 mm
Ground to Top of Exhaust Stacks
14.8 ft
4521 mm
Ground to Top of Hood
10.9 ft
3334 mm
Rear Axle - Centerline to Bumper
10.5 ft
3187 mm
Front Axle Centerline to Bucket Tip
15.3 ft
4661 mm
Wheel Base
14.9 ft
4550 mm
Maximum Overall Length
40.7 ft
12398 mm
Ground to Lower Hitch Clearance
1.9 ft
568 mm
Clearance at Maximum Lift
13.3 ft
4043 mm
B-Pin Height - Maximum Lift
19.3 ft
5887 mm
Maximum Overall Height - Bucket Raised
25.8 ft
7849 mm
Reach - Maximum Lift
6.8 ft
2062 mm
Equipment
Standard Equipment
Optional Equipment
