Description

Hyster S80FT, S120FT, H80FT, H120FT, S100FT 2013 Service Manual

I’ve seen too many LPG forklift jobs go sideways because some tech relied on a generic manual or a forum post. The Hyster S80FT, S120FT, H80FT, H120FT, S100FT 2013 Service Manual fixes that. This is the same binder the dealer techs use, straight from Hyster. 48 pages covering the GM 4.3L LPG fuel system. No aftermarket translations, no third-party edits. If you need to pull the tank, swap the DEPR, or troubleshoot the ECU, this is your blueprint.

7 Systems Covered in the Hyster S80FT, S120FT, H80FT, H120FT, S100FT 2013 Service Manual

This manual splits the LPG fuel system into seven logical work areas. You get the LPG Tank and Bracket, Fuel Filter Unit, Throttle Body, Fuel Mixer with Direct Electronic Pressure Regulator (DEPR), Control System, LP Converter, and Exhaust System. Each subsection has its own remove, install, and inspect procedures. For example, the Fuel Filter Housing with LP Vapor Sensor section walks you through removal, disassembly, cleaning, assembly, and installation. No skipping steps. The manual calls out exactly when to replace seals and what to check during inspection. That’s the difference between a repair that lasts and a comeback.

LPG Tank and Bracket: Remove and Install Exactly as Specified

Two different tank configurations are covered: one for the S80, S100, S120FT models (S4.0, 4.5, 5.5FT chassis) and another for the H135FT, H155FT models (H6.0, 7.0FT). Each has its own removal and installation steps. The bracket alignment pin procedure is also included. Never guess on hardware sequence. The manual tells you which fasteners to remove first and how to support the tank weight safely. Use the correct slings and chains — page 2 covers the lifting warnings. That page also states: “Do not lift heavy parts by hand, use a lifting mechanism.” Follow it.

Page 2 is the safety precautions section. Read it before you open the hood. It lists the mandatory steps: disconnect the battery ground cable, tag the controls, use approved blocks. That’s why I tell every new tech to start there. Skip it and you risk injury or a damaged unit. The manual is not a suggestion.

Fuel Filter Housing with LP Vapor Sensor — Don’t Skip the Clean and Inspect Step

Most aftermarket LPG guides treat the fuel filter as a simple swap. This manual dedicates four distinct sub-steps to the housing: remove, disassemble, clean and inspect, assemble, install. The LP Vapor Sensor is integrated into the housing, so if you mess up the o-ring or torque the bolts wrong, you get false low-fuel readings or leaks. The manual tells you the correct torque for the housing bolts — listed in the LPG Fuel System section. That spec is from Hyster, not a guess. You also get the low fuel sensor and low pressure switch removal and installation procedures in the Control System chapter.

What Torque Values Are Listed in This Manual?

Every threaded fastener in the LPG system has a factory torque value in the manual. The LPG tank bracket bolts, the lock-off mounting nuts, the exhaust manifold bolts, even the Oxygen (HEGO) sensor. Not general “tighten to 25-30 lb-ft” — Hyster gives a single number. For the DEPR mounting, the torque is specified for the fuel mixer assembly. If you need the charge pressure settings, they are included in the LPG Converter section. This is not a Chilton or Haynes rewrite. This is OEM data from the 2013 release. If you rely on aftermarket documentation, you are accepting risk. Don’t.

Safety Precautions Maintenance and Repair — Read Page 2 First

I already mentioned page 2, but it deserves its own heading. The manual opens with a full page of warnings specific to LPG systems: gasoline, LPG, CNG, and diesel are flammable. Batteries generate flammable gas. The manual uses WARNING and CAUTION tags — orange background for warnings on the truck. The instructions also say to use Hyster approved parts and that replacement parts must meet or exceed OEM specs. That’s the standard. If you are a home garage guy working on a forklift, do not skip this page. You are dealing with high-pressure gas and a heavy machine. The manual also tells you how to properly block the truck so it doesn’t roll. That is not in the “basic steps” – it’s front and center.

For related repairs, you might also need the Hyster 4.3L V-6 Engine Service Manual for engine internals, the Hyster A513 A514 A613 A614 A702 2014 Service Manual for other models, and the Hyster S4.0, 4.5, 5.5FT, S5.5FTS, S80 2012 Service Manual for earlier variants. If you are working on a Manual Transmission, you’ll need a separate manual — the Manual Transmission service guide covers that. This LPG manual focuses on the fuel system only, but the same safety applies. Also check the Manual Transmission section in the main Hyster service manual for drivetrain work.

Does this manual cover the H80FT and H120FT models?

Yes. The manual explicitly lists H80FT, H90FT, H100FT, H110FT, H120FT under model H4.0FT5/FT6 and H4.5FTS5, H4.5FT6, H5.0-5.5FT. That covers the H80 through H120 series.

Is the LPG lock-off procedure included?

Yes. The LPG Lock-Off section has specific remove and install steps. The lock-off is the solenoid valve that shuts off fuel when the engine stops.

What about the oxygen sensor?

There is a separate subsection for the Oxygen (HEGO) Sensor with remove and install instructions. It is part of the Exhaust System chapter. The torque for the sensor is factory-specified.

Can I use this manual for a different year?

This manual is specifically for the 2013 model year. Hyster updates service manuals with design changes. Using a 2013 manual on a 2015 truck may miss updated torque values or component differences. Get the correct year manual.

This 48-page factory manual gives you the same information the dealer technician pulls up on the laptop. No guesswork, no aftermarket shortcuts. If you work on these LPG forklifts, you need the actual Hyster specs. Get your copy and access the factory manual right now.