Caterpillar EP20 36-48V MCIII Forklift Electrical Schematic (99759-60100)

An EP20 electric counterbalanced truck moves pallets and materials around a warehouse, loading area, or yard. When one has an intermittent fault before the next rental, electricians and fleet mechanics reach for this schematic to trace the circuit instead of guessing. It is for finding wiring faults, confirming connections, and getting the truck back into service.

What this manual helps you do

• Trace full circuit routing through the EP20 electrical system.
• Check connector pin assignments, wire numbers, and wire colours.
• Diagnose electrical faults using the included diagnostic tables.
• Verify connections at switches, controllers, motors, sensors, and other electrical components.
• Troubleshoot charging, control, and drive-related wiring faults. Step-by-step repair procedures are in the companion service manual.

Who this is for

This suits warehouse maintenance technicians, dealer technicians, independent forklift shops, plant maintenance teams, and rental fleet mechanics. It's the electrician's working reference for Cat EP-series trucks, alongside the companion chassis service manual, which is also available.

FAQ

Q: What do I receive, and how is it organised?

A: You receive 2 PDF files with 182 pages total, split by section. That gives you the complete schematic set in a practical workshop format for viewing or printing.

Q: Which trucks and serials does it fit?

A: The publication covers EP16, EP18, EP20, EP25, and EP30 trucks in their 36/48V and 72/80V versions. For the EP20 36/48V, the listed serial coverage includes E1EP1-62001-up, E1EP1-82001-up, E1EP1-72001-up, E1EP1-87001-up, E1EP2-82001-up, and E1EP2-92001-up.

Q: How does it fit the job I'm doing?

A: Use it when a wiring fault, connector issue, or electrical diagnostic problem is stopping an EP20 from working. You'll have the circuit paths and connection details needed to test the system methodically.

For an EP20 36/48V MCIII, this is the right electrical reference for fault-finding and scheduled fleet repairs.

Models covered by this manual

Caterpillar publication 99759-60100 is the factory electrical schematic for the EP20 36-48V MCIII. The same publication covers 9 further forklift models: EP16 36-48V MCIII, EP16 72-80V MCIII, EP18 36-48V MCIII, EP18 72-80V MCIII, EP20 72-80V MCIII, EP25 36-48V MCIII, EP25 72-80V MCIII, EP30 36-48V MCIII, EP30 72-80V MCIII. The cover also lists EP16 36/48V, EP16 72/80V, EP18 36/48V, EP18 72/80V, EP20 36/48V, EP20 72/80V, EP25 36/48V, EP25 72/80V, EP30 36/48V, EP30 72/80V. Check the model and serial number on your data plate before ordering.

Table of Contents:

The following is a general outline of the sections covered in a Cat service manual of this type. Actual chapter numbering and section names may vary by model.

• Foreword
• General Information
• Cooling System
• Electrical System
• Controllers
• Power Train
• Powershift Transmission
• Front Axle and Reduction Differential
• Rear Axle
• Brake System
• Steering System
• Hydraulic System
• Mast and Forks
• Troubleshooting
• Service Data

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