Cat 336E H Hybrid Excavator

from Caterpillar - Cat
Created: October 16, 2012

The hydraulic hybrid system controls mostly common parts to improve material moved per gallon of fuel up to 50% over the standard 336D

The Caterpillar 336E H saves money with less fuel usage while working on a light rail extension construction jobsite in northern California
The Caterpillar 336E H saves money with less fuel usage while working on a light rail extension construction jobsite in northern California
Instead of losing the kinetic energy when braking the upper structure, Caterpillar's 336E H hybrid excavator captures that energy in accumulators and re-uses it during swing acceleration.
Instead of losing the kinetic energy when braking the upper structure, Caterpillar's 336E H hybrid excavator captures that energy in accumulators and re-uses it during swing acceleration.
The Hydraulic Hybrid Swing System stores otherwise wasted swing braking energy in accumulators and uses it to accelerate upper-structure rotation.
The Hydraulic Hybrid Swing System stores otherwise wasted swing braking energy in accumulators and uses it to accelerate upper-structure rotation.
The Adaptive Control System (ACS) Valve in the Cat 336EH hybrid excavator reduces fuel consumption by reducing pressure losses. It reroutes excess flow that would normally run over relief to...
The Adaptive Control System (ACS) Valve in the Cat 336EH hybrid excavator reduces fuel consumption by reducing pressure losses. It reroutes excess flow that would normally run over relief to circuits the need power.
The Electronic Standardized Programmable (ESP) Pump in Cat's 336EH hybrid excavator ensures smooth transitions between hydraulic pump and accumulator power. It also matches pump and engine load to...
The Electronic Standardized Programmable (ESP) Pump in Cat's 336EH hybrid excavator ensures smooth transitions between hydraulic pump and accumulator power. It also matches pump and engine load to outperform the 336E at lower engine speed.
Caterpillar field trials

Actual test result example with expert operators in 90-degree bench truck loading shows the 336E H (hybrid) dramatically outproducing the 336D with significant reduction in fuel use, for a whopping...
Actual test result example with expert operators in 90-degree bench truck loading shows the 336E H (hybrid) dramatically outproducing the 336D with significant reduction in fuel use, for a whopping 68% fuel-efficiency (tons moved per gallon of fuel) improvement.
Caterpillar field trials

Cat's test result examples in 90-degree, 180-degree and bench truck loading, as well as trenching work, shows a range from 35% top 68% fuel efficiency (tons moved per gallon of fuel) with the 336E H...
Cat's test result examples in 90-degree, 180-degree and bench truck loading, as well as trenching work, shows a range from 35% top 68% fuel efficiency (tons moved per gallon of fuel) with the 336E H (hybrid).
Cat 336E H hybrid excavator loading truck
Cat 336E H hybrid excavator loading truck
Caterpillar employs hydraulic hybrid technology that is 98% common with the conventional 336E excavator to boost fuel efficiency of the 336EH hybrid 50%.
Caterpillar employs hydraulic hybrid technology that is 98% common with the conventional 336E excavator to boost fuel efficiency of the 336EH hybrid 50%.

Caterpillar's 336E H hybrid excavator is 98% common with the standard 336E, but uses a hydraulic hybrid system to improve fuel effiency up to 25 percent. Cat says customers can expect the 37-tonne (82,000-lb.) 336E H to move up to 50 percent more material per gallon of fuel burned compared to a 336D in a variety of operating conditions.

Document: Cat 336E Hybrid Excavator

The 336E hybrid achieves fuel savings by:

Reusing energy via the hydraulic hybrid swing system, which captures the excavator’s upper structure swing brake energy in accumulators, and then releases the energy during swing acceleration
Conserving fuel with the Electronic Standardized Programmable (ESP) pump, which ensures smooth transitions between hydraulic-pump and accumulator power. It also matches pump and engine load to outperform the conventional 336E at the hybrid's lower engine speed.
Optimizing performance with the patented Adaptive Control System (ACS) valve, which intelligently manages restrictions in hydraulic flows to apply excess to circuits that need the power, so less flow goes over relief and back to tank.

Assuming today’s fuel prices and a high-production application for a 336E H, Caterpillar estimates customers can realistically expect to regain the premium they pay for the hybrid excavator in 2,000 hours of work.

308-hp Cat C9.3 ACERT diesel
Max dig depth: 24 ft. 7 in.
Max bucket size: 3.33 cu. yd.

Cat Signals Plans for Hybrid Excavators to Come

Video: Cat 336E H Keeps Rail Project on Track

Video: Cat 336E Hybrid Excavator Operators' Impressions

Document: Cat 336EH Hybrid Excavator FAQs

FCP Video: Cat Will Expand Departures from Diesel

Video: Cat Says Hybrid ROI Will Make it Core Technology in 5 Years

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