VHP caterpillar

barracane

barracane

Well-known member
VHP caterpillar
Cat D4, D5, D6, D7, D8 potenza variabile
Does anyone know how variable-horsepower Caterpillar crawler tractors work?
We rented a D6 VHP to till the soil. How does it work? Thanks.
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CATERPILLAR D6D VHP Special Application
A tidy agricultural spec crawle
 
barracane

barracane

Well-known member
What type of transmission does it have? Hydrostatic, hydrodynamic, hydraulic, power shift converter?

How does it work? I'm a total noob in mechanics. Could you explain the concept to me with some simple examples? Thanks.

un cavallo uccide una mosca 100 mosche un cavallo della serie allearsi con le giuste persone per combattere un nemico comune è vantaggioso l'unione fa la forza..



The Caterpillar D6D SA VHP (Special Application, Variable Horsepower) is a highly regarded agricultural crawler from the 1970s/80s, featuring 165 HP in lower gears (1-2) and 216 HP in higher gears (3-6). Designed for heavy, efficient field cultivation, these tractors often lack dozers, focusing on high-drawbar work.
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Key Features & Forum Insights:
  • VHP System: The engine increases power as ground speed increases, ideal for heavy, fast agricultural tasks.
  • Agricultural Focus: Unlike industrial models, "SA" models frequently feature rear linkages and auxiliary hydraulics for tillage.
  • Reliability: Users on ACMOC and Yesterday's Tractors value them for their high-speed capability and lack of complex electronics.
  • Inspection Points: Key areas to check for leaks and wear include the torque converter (on powershift models) and final drives under load

The Caterpillar D6D SA VHP (Special Application, Variable Horsepower) is a highly regarded agricultural crawler from the 1970s/80s, featuring 165 HP in lower gears (1-2) and 216 HP in higher gears (3-6). Designed for heavy, efficient field cultivation, these tractors often lack dozers, focusing on high-drawbar work.
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Key Features & Forum Insights:
  • These machines are lauded as durable, rebuildable agricultural tools, often deemed superior to newer rubber track systems for specific soil-management tasks.
    If you'd like, let me know:
    • Are you looking for parts, manuals, or troubleshooting?
    • Is it a powershift or direct drive model?
    • What specific, technical issues are you facing?
 
Bri963

Bri963

Well-known member
They have a normal gearbox with sliding mesh gears and an oil bath mechanical clutch. The gear linkage connects to a mechanical fuel injection pump and in the higher gears increases fuel supplied to the engine.
 
barracane

barracane

Well-known member
so on the diesel injection pump, the more revs the more torque I assume if I understood correctly thanks



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Hersteller Logo Caterpillar

Caterpillar D4-15A​

 
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