Description

LS Tractor J23 HST, J27 HST Parts Catalog – OEM Factory Specs for 291 Pages

You know the frustration. You’re staring at a blown hose or a cracked housing, and you need one part number. The aftermarket listings give you three different numbers, none of them match what’s on the old part, and the dealer’s parts guy is on lunch. That’s when you waste an hour cross-referencing, and your machine sits another day. This LS Tractor J23 HST, J27 HST Parts Catalog ends that. It’s the factory PDF – 291 pages of OEM part numbers, exploded views, and exact quantities. No translations, no reprints, no third-party edits. Just the list LS Tractor put together for their own dealers.

Cylinder Head and Valve Mechanism: What’s Inside

Page 2 of the catalog drops you straight into the Cylinder Head assemblies for both the J23 HST and J27 HST. You get separate breakdowns for each model – Q116S01-1 for the J23, Q116S01-2 for the J27. The Valve Mechanism section (Q121S01-1) covers both. Need a Valve, a Camshaft, a Crankshaft? They’re all listed with factory reference numbers. The Rocker Cover & Camshaft section (Q115S01-1) gives you the gasket and bolt kit numbers too. If you’re rebuilding an Engine, don’t guess which piston ring set fits – the catalog spells out Piston and Connection Rod groups for each displacement. 23 and 27 are not interchangeable; the part numbers prove it.

Does This Catalog Cover the HST Transmission?

Yes. The HST section starts on page 3 with assembly G270S01-1 for the J23. You’ll find the Transmission Case, Main Shaft, Range Gear Shaft, PTO Drive Shaft, and 4WD Shaft all exploded and numbered. The HST Control and Range Lever are included. If you’re servicing a hydrostatic unit and need the exact seal or bearing number, this is where you look. The Rear Differential, Diff-Lock, and Front Axle Assembly are all broken down by model. Don’t trust an aftermarket list that lumps J23 and J27 parts together – this catalog separates them by figure number.

7 Major Systems from the Table of Contents

Flip through and you’ll find these systems fully mapped:

• Engine (Cylinder Head, Crankcase, Timing Gear, Oil System, Cooling System, Fuel System)
• Transmission (HST, Range Gear, PTO, 4WD)
• Rear Differential & Diff-Lock
• Front Axle Assembly
• Steering Cylinder & Lines
• Brake and Brake Pedals
• Electrical Wiring

Each section has its own figure numbers and part listing. The Fuel System alone runs five sub-pages (Q125S01-1 through Q125S01-5) covering injection pump, lines, and filter. The Cooling System (Q135S01) includes the Radiator and fan assembly. You won’t find a generic illustration here – every line is traceable to a factory assembly drawing.

Get the Correct Part Numbers the First Time

When you’re ordering parts for these tractors, one wrong digit means a week waiting for the wrong shipment. Factory parts catalogs eliminate that. You get the exact number printed by LS Tractor – not a recompiled list from a third-party scanner. The Overhaul Gasket Kit is listed separately for the J23 (Q065S01-1) and J27 (Q065S01-2). The Electric Parts section covers starter, alternator, and wiring harness numbers. If you’re working on a J23 HST and need a Cylinder head, you look up Q116S01-1. Period.

LS Tractor J23 HST, J27 HST Parts Catalog – Why Factory Matters

Aftermarket parts catalogs merge models, skip pages, and sometimes list superseded numbers without note. This PDF comes from the original factory print. Every page matches what LS Tractor shipped to their dealers. Page 2 shows the Cylinder Head and Lifting Eye for both models. Page 3 covers the HST and Transmission Case. No missing figures, no scanned-in hand-written notes. The file is searchable, so you can type “Crankshaft” and land on Q120S04-1 or Q120S04-2 depending on your model. That’s the kind of precision that keeps your tractor running and your wallet intact.

If you’re serious about maintaining a J23 HST or J27 HST without playing part-number roulette, this is the file you need. Access the Factory Manual and keep it on your tablet next to the workbench.

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Is this the original LS Tractor parts catalog?

Yes. Printed from factory PDF. 291 pages of OEM part numbers.

Does it include torque specs?

No. This is a parts catalog, not a service manual. It lists components and their part numbers. For assembly torque values – like head bolts or oil pan bolts – you need the corresponding service manual. The parts catalog gets you the right bolts; the service manual tells you how tight they go. Two different tools.

Can I use this to order parts from a dealer?

Absolutely. The part numbers match LS Tractor’s ordering system. Show your dealer the number from page 2 for cylinder head components and they’ll get you the right part every time.

Will this manual help me rebuild my engine?

If you’re doing a rebuild, this catalog identifies every part you need – Cylinder, Valve, Camshaft, Crankshaft, Cooling components, Fuel injectors, Engine gaskets, piston rings, and bearings. You still need a service manual for step-by-step procedures and torque specs, but with this catalog you’ll order the correct overhaul gasket kit and avoid mismatched parts.