ZF Ecomat

The ZF Ecomat series was a series of transmissions for buses and was first introduced in 1980. The Ecomat transmissions were able to be equipped with a retarder and feature neutral vehicle stop. The Ecomat transmissions were offered in 4 or 5 or 6 speed variants.

Transmission naming decipher

xHP-xxx

xHP = Number of Gears

• Available Values
  • 4
  • 5
  • 6

xHP = Hydraulic converter and Plantary Gearset

xHP-xxx = Series of input torque acceptance

• 50x
  • General Usage
    • 30-35 foot buses
• 59x
  • General Usage
    • 40-45 foot buses
• 60x
  • General Usage
    • Motorcoaches
    • Artic buses
• xHP-xx4
  • Series
    • 0 Original generation of transmission
    • 2 Second generation introduced in 2001
    • 4 Third generation introduced in 2006

For example 5HP-592 equals ZF Ecomat II five speed transmission which is capable of receiving 1250 Nm of input torque via the engine's flywheel. Which is generally used on 35-45 foot transit buses.

Differences

Thoughout the years, there has been technological improvements that were made to the transmission

The Ecomat 2

• New CAN Shift module thus the C after the name
• New 5HP-602 Verison available using alternative gear ratios (2.81 1.84 1.36 1.00 0.80)
• Upgraded Electronics

The Ecomat 4

• Topodyn to regulate shifting based on topograhy - Up until now the Ecomat has been supplied with a pre-set gear points. Using performance settings ranging from Super Economy up to Power. Availible starting in 2008
• Increased torque on the HP604C

Specs

Type (5 or 6 speed)	Max. input torque	Max. input speed	Mass w/ retarder	1	2	3	4	5	6	R
HP502C	811 ft lbs (1100 N⋅m)	2800	355 kg	3.43	2.01	1.42	1	0.83	0.59	4.84
HP552C	N/A	N/A	N/A
HP592C	922 ft lbs (1250 N⋅m)	2800	357 kg
HP602C	1180 ft lbs (1600 N⋅m)	2650	368 kg
HP504C	811 ft lbs (1100 N⋅m)	2800	355 kg
HP554C
HP594C	922 ft lbs (1250 N⋅m)	2800	357 kg
HP604C	1291 ft lbs (1750 N⋅m)	2650	368 kg