CAT 988K Wheel Loader

Engine Details

Net Power 541 hp (403.5 kw)
Rated Speed 1700 rpm
Displacement 1105 cu in (18.2 L)
Torque Rise 58 %
Bore 5.7 in (144.8 mm)
Stroke 7.2 in (182.9 mm)
Emissions U.S. EPA Tier 4 Final/EU Stage IV OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent
Net Power – Sae J1349 541 hp (403.5 kw)
Engine Model Cat C18 ACERT
Peak Torque – 1,200 Rpm 2104 lb ft (2852.7 Nm)
Gross – Iso 14396 580 hp (432.6 kw)
Peak Power Speed 1,500 rpm
Peak Power Speed – 1,500 Rpm – Gross – Iso 14396 580 hp (432.6 kw)
Peak Power Speed – 1,500 Rpm – Gross – Sae J1995 588 hp (438.5 kw)
Peak Power Speed – 1,500 Rpm – Net Power – Sae J1349 541 hp (403.5 kw)

Operational Specs

Operating Weight 112574 lb (51062.8 kg)

Transmission

Transmission Type Cat planetary power shift
Forward – 1 4 mph (6.5 km/h)
Forward – 2 7.2 mph (11.6 km/h)
Forward – 3 12.7 mph (20.5 km/h)
Forward – 4 21.6 mph (34.8 km/h)
Reverse – 1 4.7 mph (7.6 km/h)
Reverse – 2 8.3 mph (13.4 km/h)
Direct Drive – Forward 3 13.9 mph (22.4 km/h)
Direct Drive – Reverse 3 15.8 mph (25.5 km/h)
Direct Drive – Forward 4 24.4 mph (39.3 km/h)
Direct Drive – Forward 2 7.8 mph (12.6 km/h)
Direct Drive – Reverse 2 8.9 mph (14.4 km/h)
Direct Drive – Forward 1 Lock-up disabled
Direct Drive – Reverse 1 5 mph (8.1 km/h)
Reverse – 3 14.4 mph (23.2 km/h)

Buckets

Bucket Capacities 4.7-13 m3 (6.2-17 yd3)

Axles

Front Fixed
Rear Trunnion
Oscillation Angle 13 degrees

Brakes

Brakes SAE J1473 OCT90, ISO 3450:1992

Operating Specifications

Bucket Capacity Range 4.7-13 m3 (6.2-17 yd3)
Cat Truck Match – Standard 770-772
Cat Truck Match – High Lift 773-775
Rated Payload – Quarry Face 27557.8 lb (12500 kg)
Rated Payload – Loose Material 35274 lb (16000 kg)

Service Refill Capacities

Cooling System 31.7 gal (120 L)
Fuel Tank Capacity 188 gal (711.7 L)
Crankcase 15.9 gal (60.2 L)
Transmission 31.7 gal (120 L)
Differential – Final Drives – Front 49.1 gal (185.9 L)
Differential – Final Drives – Rear 49.1 gal (185.9 L)
Hydraulic System Factory Fill 125.5 gal (475.1 L)
Hydraulic System – Tank Only 63.4 gal (240 L)
Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage Iv Only) 8.7 gal (33 L)
Coolant (Validated By Test Cell Fill Quantities) 33 gal (125 L)
Transmission – Validated By Test Cell Fill Quantities 29 gal (109.8 L)

Hydraulic System – Lift/Tilt

Lift/Tilt System – Circuit EH- Positive Flow Control, Flow Sharing
Relief Valve Setting – Lift/Tilt 4757 psi
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)
Pilot System Variable displacement piston
Lift/Tilt System Variable displacement piston
Relief Valve Setting 551 psi
Maximum Flow 13.7 gal/min
Maximum Flow At 1,400-1,860 Rpm 153 gal/min

Hydraulic System – Steering

Steering System – Circuit Pilot, load sensing
Steering System – Pump Piston, variable displacement
Relief Valve Setting – Steering 4351 psi
Steering Cycle Times – Low Idle 5.6 s
Steering Cycle Times – High Idle 3.4 s
Maximum Flow 71.3 gal/min

Hydraulic Cycle Time (1,400-1,860 Rpm)

Rack Back 4.5 s
Raise 8 s
Dump 2.2 s
Lower Float Down 3.5 s
Total Hydraulic Cycle Time – Empty Bucket 18.2 s

Sound Performance – Tier 2 Equivalent/Stage Ii: Standard

Machine Sound Level (Iso 6395) 112 dB(A)
Operator Sound Level ( Iso 6396) 73 dB(A)

Sound Performance – Tier 2 Equivalent/Stage Ii: Suppression

Operator Sound Level (Iso 6396) 72 dB(A)
Machine Sound Level (Iso 6395) 110 dB(A)

Sound Performance – Tier 4 Final/Stage Iv – Standard

Operator Sound Level (Iso 6396) 72 dB(A)
Machine Sound Level (Iso 6395) 111 dB(A)

Sound Performance – Tier 4 Final/Stage Iv: Suppression

Operator Sound Level (Iso 6396) 72 dB(A)
Machine Sound Level (Iso 6395) 109 dB(A)
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