Caterpillar 977K
Image needed LHB
Model history
Model introduced 1966
Model discontinued Unknown
Model status Unknown
Preceded by Caterpillar 977H
Superseded by Caterpillar 977L
Engine Specification
Engine make Caterpillar
Engine model D333
Fuel type Diesel
Power hp 170
Power kW 130
Cooling system Water
Transmission Details
Transmission type Unknown
Drive tracked
Linkage Category Unknown
Other info
Factories USA
Plow rating Unknown
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The Caterpillar 977K crawler loader was introduced in 1966 in the USA. Production began in Japan in 1967 and Scotland a year later.[1]

Basic spec Edit

The 977K has a D333 turbocharged, six-cylinder engine producing 170 hp (130 kW) (FWHP). It has a three-speed powershift transmission. It comes standard with oil cooled clutches and brakes, pedal steer, and electric start.

The 977K was manufactured in the USA, with an 11K or 46H serial number prefix; in Japan with a 70J or 76H prefix; and in Scotland, with a 48J prefix.

The 46H unit has a walk-through operator’s compartment.

Modifications/updates Edit

Production of 46H ended in 1967.

Production of 76H ended in 1968.

In 1970 Caterpillar modified the final drive, beginning with 70J00569, 48J00376, and 11K03019.

In 1971 a sealed loader linkage was added, beginning with 70J01083, 48J00584, and 11K03687.

Caterpillar replaced 977K with 977L in 1971, but retained the 977K serial number prefixes. The 977L features increased horsepower to 190 hp (140 kW) FWHP, beginning with 70J01303, 48J00586, and 11K03919.

In 1973 a rollover protection system (ROPS) was added to the American unit, beginning with 11K05417. Cat also added a two-piece master link, beginning with 11K05959.

In 1974 Cat added a sleeve metering fuel system, beginning with 70J02754 and 11K07130.

In 1975 a sealed and lubricated track (SALT) was added, beginning with 70J03167 and 11K07292. A ROPS canopy was made standard on the American unit, beginning with 11K07500.

In 1976 the Japanese unit received ROPS adaptability, beginning with 70J03307.

In 1977 Cat added an interim scroll fuel system, beginning with 70J03329.

Production of 70J, 48J, and 11K ended in 1978; they were replaced by new 977L units.

Cat 977LEdit

The Caterpillar 977L has a 3306 six-cylinder engine producing 190 FWHP. It has a powershift transmission. It comes standard with SALT and ROPS adaptability.

The 977L was manufactured in the USA, with a 14X prefix; in Japan, with a 95X prefix; and in Scotland, with a 64X prefix.

The American unit has suspended pedal steering, a sound suppressed cab, and a cartridge pin in the lower bucket joint.

The Japanese unit has a turbocharged engine.

Caterpillar offered a certified rebuild program with this model. Units beginning with the following serial number run were certified rebuilds: 70J75000, 95X75000, 48J75000, 64X75000, and 11K75000.

Production of 977L ended in Japan in 1981, USA in 1982, and Scotland in 1983.

Based on data from the sales database of Ritchie Bros. Auctioneers, it is estimated that more than 22,100 Caterpillar 977K/977L crawler loaders have been produced.

Highest Serial #
70J 03630
76H 00229
95X 01381
48J 02670
64X 01538
11K 08987
14X 02540
46H 01199
Total = 22,174

See alsoEdit


External linksEdit

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