Description

Manitou MT6642XT, MT8044XT, MT10044XT, MT10055XT, MT12042XT Service Manual

You’ve got a Manitou telescopic handler on the lift that isn’t tracking right, or maybe a hydraulic leak that’s taking too long to pin down. Before you crack another fitting blind, get the factory documentation that matches the machine’s serial number. This is the Manitou MT6642XT, MT8044XT, MT10044XT, MT10055XT, MT12042XT Service Manual — 114 pages of OEM data, not some aftermarket reprint that guesses at torque values. I’ve seen guys snap bolts using third-party specs that were off by 15 ft-lbs. Waste of time and parts.

This manual covers five models with specific serial number ranges printed on page 3: MT6642XT starting at S/N 27251, MT8044XT at 28251, MT10044XT and MT10055XT at 80151, and MT12042XT at 38101. If your machine falls inside that range, this document matches the factory build. The first chapter (Introduction – Identification) walks you through locating the model and serial number decal inside the cab.

Specifications and Identification Data

Chapter 2 (Specifications) gives you the dry numbers: engine ratings, hydraulic pump flow, tire sizes, and fluid capacities. Don’t guess which hydraulic oil grade to use — it’s printed in the manual. Cross-referencing with the operator’s manual is optional if you have this, but the operator manual sometimes has additional usage notes. Check the Manitou MT6642XT, MT8044XT, MT10055XT Operators Manual – Factory Specs for Safe if you need daily operation guidance.

Safety: The Chapter You Don’t Skip

Chapter 4 (Safety) is four pages of warnings that apply whether you’re in the seat or under the frame. Includes California Proposition 65 warnings for diesel exhaust and battery components — you see that on page 4 of the original print. The manual states: “Do not start, operate or work on this machine until you have carefully read and thoroughly understand the contents.” That’s not legal boilerplate; it’s the difference between a clean job and a hospital visit.

Service Intervals: 10 Hours to 2000 Hours

Chapter 8 (Service and Storage) breaks maintenance by hours — 10, 50, 100, 250, 1000, 2000 — plus an As Required section and PWP troubleshooting. The 1000-hour service includes checking transmission temperature sensors and hydraulic oil level. The 2000-hour interval covers hydraulic filter replacement and full lube points. Each sub-chapter lists the tools you’ll need, so you aren’t halfway through a job hunting for a 14-mm Allen socket.

Torque Specifications and Load Zone Charts

Chapter 10 (Maintenance) holds the real gold: Engine Diagnostic Trouble Codes, Hydraulic Schematics, Electrical Schematics, Load Zone Charts, and Torque Specifications. The torque specs are OEM factory numbers — not “tighten until it feels right.” If you’re rebuilding a boom cylinder, you get the exact ft-lb for each fastener. The load zone charts tell you the safe operating envelope for each model at various boom angles and extensions. Cross-check with the Manitou MT6642T MT6642XT MT8044XT Parts Catalog if you need part numbers for replacement seals.

Electrical schematics cover the control harness, indicator lights, and starter circuit. Hydraulic schematics show flow paths for the main pump, steering, and auxiliary circuits. Don’t try to trace a wiring fault with a generic diagram — this manual gives you the factory wire colors and connector pinouts.

Engine Diagnostic Trouble Codes

Section 10 includes a table of diagnostic trouble codes for the diesel engine. If the check engine light is on, you can pull the code and lookup the fault description, probable cause, and corrective action. Saves hours of diag time. The same section has the electrical and hydraulic schematics referenced earlier. Pair with the Manitou Z80 800Z 2015 Service Manual – OEM Specs & 728 Pages if you work on other Manitou models.

Why This Beats Aftermarket Manuals

Aftermarket manuals often reprint outdated data or skip sections to save paper. This is a direct scan of the OEM document catalog 50960025 Revision C. Every page matches what the dealer uses. The Index – A through E, F through O, and P through W sections let you find procedures fast without flipping through the whole book. I’ve used aftermarket manuals that didn’t even include the safety decal locations — this one has Chapter 9 specifically covering decal placements.

External resources like a standard Manual Transmission rebuild guide won’t help with Manitou’s specific hydraulic shuttle shift. Stick to the factory source. For general transmission theory, check this Manual Transmission article, but for the actual pump pressures and clutch clearances, the OEM manual is the only reliable reference.

Frequently Asked Questions

Does this manual include both operator and service information?

Yes. The document is titled “Operator/Service Manual.” Chapters 1–7 cover operation, safety, and daily checks; chapters 8–10 cover service, maintenance, and schematics.

What serial numbers does it cover?

MT6642XT from S/N 27251, MT8044XT from 28251, MT10044XT and MT10055XT from 80151, MT12042XT from 38101. If your machine is earlier, contact Manitou for the correct revision.

Are torque values given in imperial units?

Yes. All fastener torques are in foot-pounds. The manual uses imperial throughout, as required by the North American market.

Can I get hydraulic schematics for the auxiliary circuit?

Yes. Chapter 10 includes full hydraulic schematics showing the main pump, steering circuit, auxiliary valve bank, and return lines. The electrical schematics cover the companion wiring for solenoid valves and sensors.

If you’re tired of chasing ghosts with half-baked diagrams, this is the document that will get the machine back to work. Access the Factory Manual and keep it on your tablet or print the pages you need. One job using the correct torque spec pays for the whole manual.