Description

Genie GTH-844, GTH-844A, GTH-844B 2013 Service Manual

If you are wrenching on a Genie GTH-844, GTH-844A, or GTH-844B telehandler and you don’t have the factory Genie GTH-844, GTH-844A, GTH-844B 2013 Service Manual from Genie, stop what you are doing. I have seen too many broken bolts and leaking fittings from guys relying on aftermarket data or guessing. This is the OEM manual printed in 2013, Part No. 218230, 134 pages. It covers serial numbers from GTH0813-16606 onward. Everything you need to keep that machine in the field is right here.

Specifications Section: What You Need to Know

Section 2 is where the real data lives. Machine specs, performance figures, hydraulic component specs, and torque charts for SAE and metric fasteners. The manual includes a dedicated page for hydraulic hose and fitting torque specifications. You also get AC refrigerant specs and the full breakdown for each engine option: Deutz TCD3.6 L4, Perkins 1104D-E44TA, and Perkins 854E-E34TA. The Dana T12000 transmission and Carraro 26.27M drive axle specs are listed with fluid capacities and adjustment points. If you need charge pressure, filter part numbers, or belt tensions, this is the section.

Engine Options: Deutz and Perkins Differences

The manual treats each engine separately. For the Deutz models, you get fault codes in Section 5 and specific maintenance checklists like C-1, D-5, and E-4. For Perkins models, checklists C-2, C-3, D-6, D-8, E-2, E-3, E-5, E-7. Each engine has its own oil type, filter cross-reference, and injection pump timing procedure. Do not try to swap parts between them without consulting these pages. The torque specs for cylinder head bolts and main bearing caps are different. The manual spells it out.

3 Maintenance Checklists That Keep the Machine Running

Section 3 lays out five checklist categories (A through E) with specific procedures. A-5 covers engine maintenance for all models. B-5 is where you find lug nut torque values for the tires. C-4 walks you through inspecting and lubricating the sequencing chains. D-1 tells you how to inspect the forks for cracks and wear. E-1 is the hydraulic oil test and replacement procedure. Each checklist includes a step-by-step list with required tools and safety warnings. For example, the transmission maintenance in A-6 and A-9 specifies fluid level checks and filter replacement intervals. You also get the Pre-delivery Preparation Report and Maintenance Inspection Report forms – fill them out and date them.

Torque Specs: Why OEM Data Matters

I cannot stress this enough. Aftermarket manuals copy numbers from the internet and get them wrong. This manual has the official Genie torque values for every threaded fastener on the machine. Hydraulic hose fittings, axle bolts, engine fasteners, and wheel lug nuts. Use the wrong torque and you either snap the bolt or leave it loose. Either way, you ruin your day. The manual provides both SAE and metric torque charts in Section 2. Every scheduled maintenance procedure that requires torquing – like B-5 for lug nuts – refers back to those charts. That is the kind of documentation that saves you from buying a new axle.

Does This Manual Cover the Dana T12000 Transmission?

Yes. The Dana T12000 transmission has its own specification page in Section 2. Section 3 includes transmission maintenance under A-6, A-9, and D-4. Section 4, Repair Procedures, provides step-by-step removal and installation for the transmission (procedure 5-1). You also get the electrical and hydraulic schematics in Section 6 that show how the transmission interacts with the drivetrain control circuit. If you need to rebuild a Manual Transmission on this machine, the manual gives you the clutch pack clearances and torque sequences. For a deeper look at the hydraulic pump and manifold adjustments, check the related Genie GTH-644 GTH-842 GTH-844 2006 Parts Catalog.

Fault Codes and Schematics: Diagnostic Power

Section 5 lists engine fault codes for both Deutz and Perkins powertrains. The diagnostic display procedure walks you through reading the codes without a scan tool. Section 6 includes a fuse box layout, electrical component and wire color legend, and full schematics. There are two electrical schematic views for the GTH-844, and two hydraulic schematics – one for single joystick and one for dual joysticks. If the machine stalls under load or the boom drifts, trace the circuit using these schematics. For a broader set of Genie telehandler procedures, see the Genie GTH Series 2007 Service Manual and the Genie GTH-644 GTH-842 GTH-844 2017 Parts Catalog – Section: Operators. Also, if you are working on another make of equipment, the Manual Transmission resources are helpful for understanding general transmission mechanics.

FAQ

Can I use this manual for a GTH-844A with a Perkins engine?

Yes, it covers all three engine options.

What torque specs are included?

The manual includes hydraulic hose and fitting torque specifications, SAE and metric fastener torque charts, axle lug nut torque values, and engine-specific fastener torques for all three engine options. You’ll find these in Section 2 under “Hydraulic Hose and Fitting Torque Specifications” and “SAE and Metric Fasteners Torque Charts”. Also, the scheduled maintenance procedures list lug nut torque in Checklist B-5. Having the correct torque prevents leaks and broken bolts. Plus, the axle maintenance and transmission procedures specify torque values for critical bolts. If you use aftermarket specs, you risk stripping threads or under-torquing, leading to component failure. This manual gives you the real numbers from Genie.

You need this manual on your bench. Don’t trust a photocopy or a PDF from a shady site. This is the factory Genie Service Manual – the same one the dealer uses. It covers the GTH-844, GTH-844A, and GTH-844B. 134 pages of torque specs, maintenance checklists, engine and transmission procedures, fault codes, and full schematics. Stop guessing and start fixing. Access the Factory Manual now.