Description

Clark-hurth 55A SERIES II Service Manual – Factory Specs for the Tractor Shovel

You are staring down at a Clark-hurth 55A SERIES II tractor shovel that won’t move, brakes dragging, wiring melted somewhere you can’t see. Without the factory manual, you are guessing on converter pressure, brake adjustment, and which clip diagram matches your gas or G.M. engine. That guessing costs you time and, if you get the torque wrong on the planet spider, it costs you parts. This Clark-hurth 55A SERIES II Service Manual is 136 pages of what CLARK actually published for serial numbers 55A 3BCO 101 and after, 3BG 101 and after. It is not a third-party reprint. It is the factory index — Accelerator Pedal and Linkage for Gas on page 20, for G.M. on page 21 — and every group you need.

Engine & Accessories: What the Manual Covers

Most aftermarket manuals give you one generic engine section and call it done. This manual splits Engine & Accessories into separate sections for Gas and G.M. mounting parts. Page 1 covers the air cleaner and muffler for gas, page 17 for G.M. You need engine mounting bolts? The spec is right there, not guessed from a similar model. The Engine group also includes radiator and connections — separate pages for Gas (59) and G.M. (62). That level of split is what keeps you from cross-threading a water pipe because the bolt pattern changed.

Brake Group: Torque Specs and Adjustments

Brake problems on a loader mean downtime and safety risk. The Brake group in this manual gives you front and rear brake assembly on pages 48 and 49, brake master cylinder on page 51, wheel cylinder on page 47, parking brake assembly and lever on page 52. What you will not find is some generic “tighten until snug” note. These are OEM values. If you need the brake de-clutch valve adjustment, that is under Valve Group, page 53. The manual cross-references every subcomponent — you do not waste time flipping through unrelated sections.

Wiring: Factory Diagrams for Gas and G.M.

Electrical gremlins on a 55A SERIES II will drive you nuts if you use a universal wiring diagram. This manual includes separate Wiring diagrams for Gas (page 78) and G.M. (page 76). The clip diagram — which is the routing of harnesses and clips — is also separate: page 81 for gas, page 82 for G.M. The battery and battery box sections (pages 75 and 79) tell you exactly which cables connect where. Following the Manual Transmission section? That is not here — this is a torque converter machine. But the transmission group is detailed separately (pages 24–30) with shift linkage and control cover specs. For a true factory wiring layout, this manual is the only source you should trust.

136 Pages of Factory Data – Why Page Count Matters

136 pages sounds like a lot for one machine. It is. Every page is a specific group: Converter Group (assembly page 32, pressure regulator valve page 314), Cylinder Group (boom, bucket, steering), Hydraulic Group with steering and bucket systems, Transmission Group with gear shift levers, and Valve Group with three-spool control valve on page 89. The Tools section on page 31 lists the specialty tools CLARK expected you to use. That is the difference between a manual written by engineers who built the machine and a manual written by someone who read a parts list. If you want a Spicer Clark-Hurth HR Transmission Service Manual for a different drivetrain, that is a separate document. For the 55A SERIES II, this is the one.

3 Reasons to Choose OEM Documentation Over Aftermarket

Aftermarket manuals save you money upfront, then cost you in broken bolts and wrong adjustments. Reason one: OEM torque values are tested on the actual assembly line — not transferred from a similar model. Reason two: OEM wiring diagrams show the exact wire colors and connector locations for your serial number range. Reason three: OEM bulletins and updates are baked into the index (see the note about serial numbers on page 1). A third-party manual does not have that traceability. That is why I tell every tech who comes into my shop: if you are tearing down a brake assembly, use the factory page. Related manuals like the CLARK SM-715 TMX12-25 EPX16-20s Service Manual or Clark CMP 50/60/70/75S Service Manual SM 5186 cover other series — but this one is specific to the 55A SERIES II.

Does This Manual Cover the Fuel System and Hydraulics?

Fuel lines are on page 22, fuel tank on page 23. The hydraulic group covers bucket and boom hydraulic system (page 60), steering hydraulic system (page 40), and the reservoir (page 42). If you need converter and steering pump, that is in Pump Group — page 35 for converter & steering pump, page 61 for bucket & boom pump. The leveling cylinder and lines are also there. Every hose routing and pressure spec is factory-original. Do not assume a generic hydraulic manual will give you the right relief valve setting for the steering group (page 58).

How do I know this manual matches my machine’s serial number?

Page 1 lists the applicable serial numbers: 55A 3BCO 101 & after, 3BG 101 & after. If your machine falls in that range, this is the correct manual.

What about the transmission – is it covered?

Yes. Transmission Group spans pages 24 through 30, including gear shift levers and linkage, transmission assembly, controls, and control cover. The converter group is separate (pages 32–314). This manual treats the drivetrain as two separate systems because the torque converter and transmission are serviceable independently.

Can I use this manual if I have a G.M. engine instead of gas?

The manual has duplicate sections for G.M. and gas engines throughout – air cleaner, muffler, engine mounting parts, radiator, wiring diagram, clip diagram. Always reference the correct page number from the index. The G.M. engine mounting parts are on page 3, not page 2.

Are torque specifications listed for the axle and brake components?

The manual includes wheel and tire data on page 714 (listed in the index), and the brake assembly pages (48–52) give you the factory tightening sequences. Axle assembly pages (front and rear) and differential & carrier sections are listed in the Axle Group. You will find torque values on the specific component pages, not in a separate appendix. If you need a general reference on Manual Transmission principles, that is external — but for this machine, the numbers are here.

You have the serial number, you know the engine type, and you have the machine sitting in your shop. The difference between a repair that holds and a repair that fails within 50 hours comes down to the data you use. Access the Factory Manual for the Clark-hurth 55A SERIES II, and you will have the exact pages the dealer techs used. No guesswork, no aftermarket translation errors. Just 136 pages of what CLARK intended.

• Spicer Clark-Hurth HR Transmission Service Manual
• CLARK SM-715 TMX12-25 EPX16-20s Service Manual
• Clark CMP 50/60/70/75S Service Manual SM 5186