Caterpillar 951B Crawler Loader
Cat 951C traxcavator at EM wd 2011 - IMG 0513
Model history
Model introduced 1967
Model discontinued Unknown
Model status Unknown
Engine Specification
Engine make Caterpillar
Engine model D330
Fuel type Diesel
Power hp 85
No. of Cylinders 4
Cooling system Water
Transmission Details
Transmission type Unknown
Drive tracked
Linkage Category Unknown
Other info
Factories USA, Japan
Plow rating Unknown
Web site
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Cat 951 loader safty notice - IMG 0515

Safety notice on Caterpillar 951C for propping loader

The Caterpillar 951B crawler loader was a crawler loader built by Caterpillar Inc. which was introduced in 1967. Initially it was built in the USA and Japan. Production began in France a year later.


The Caterpillar 951B has a four-cylinder Caterpillar D330 engine producing 85 hp (63 kW) (FWHP). It comes standard with electric start.

A direct drive transmission was offered in the 72J and 78J prefix units.

All other units have powershift transmission and pedal steer (15H, 32F, 69H, 79H and 86J prefixes).

60-inch (152-cm) track gauge was offered on the 69H, 32F, and 86J prefix units


The 951B was manufactured in;

  • USA, with a 79H or 86J serial number prefix.
  • Japan, with a 15H, 32F, 72J, or 78J prefix
  • France, with a 69H prefix

Updates - 951B Edit

Production of 15F, 78J, and 79H ended in 1968.

Production of 72J ended in 1970.

951C introductionEdit

Caterpillar replaced the 951B with 951C in the USA and Japan in 1970.

Most 951C units continued the previous 951B prefixes, but one new Japanese was introduced, with a 19H prefix.

The 19H unit has a four-cylinder Caterpillar 3304 engine producing 85 FWHP. It has a direct drive transmission. It comes standard with electric start, pedal steer, and a sealed loader linkage.

Updates - 951CEdit

In 1971 and 1972 Cat added a sealed loader linkage, beginning with 69H01833, 32F00902, and 86J01992. At the same time the 32F and 86J units receieved hydraulic track adjusters, an automatic bucket positioner standard, and increased horsepower to 95 FWHP. The French unit received these other features beginning with 69H01869. The 19H unit had its horsepower increased to 95 FWHP, beginning with 19H01567.

In 1972 and 1974 a sleeve metering fuel system was added, beginning with 69H03509, 19H02173, 32F01330, and 86J02598. At the same time the 86J unit received a rollover protection system (ROPS).

In 1976 and 1977 Cat added a sealed and lubricated track (SALT), beginning with 69H04330, 19H02509, 32F01560, and 86J04520.

In 1977 an interim scroll fuel system and ROPS were added, beginning with 19H02474 and 32F01555.

Production ended in the USA in 1980.

Production ended in Japan and France in 1981.

Serial numbersEdit

Based on data from the sales database of Ritchie Bros. Auctioneers, it is estimated that more than 17,200 Caterpillar 951B/951C crawler loaders have been produced.

Highest Serial #
69H 05811
15F N/A
19H 02644
32F 01771
72J 01146
78J N/A
79H 00354
86J 05514
Total = 17,240


A number of examples are now with collectors in the UK and the USA.

List known examples below


Add your 951B and C photos below

See alsoEdit

References / sourcesEdit

External linksEdit

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