Description

Clark-hurth 18000 1993 Service Manual – 74 Pages of Factory Transmission Specs

I’ve seen too many guys crack a clutch housing because they used a third-party spec. That’s not happening with the Clark-hurth 18000 1993 Service Manual. This is the factory book – 74 pages covering the 2 and 3 speed inline powershift transmission. Clark-hurth put their name on it, so every torque value, clearance, and pressure check point came off the assembly line.

What You Get: 74 Pages of Factory Transmission Data

DISASSEMBLY OF TRANSMISSION starts on page 1. CLUTCH DISASSEMBLY on page 12. CLEANING AND INSPECTION on page 22. REASSEMBLY OF TRANSMISSION on page 23. The manual also includes DRIVE PLATE INSTALLATION on page 43 and TRANSMISSION TO ENGINE INSTALLATION PROCEDURE on page 44. The TROUBLE SHOOTING GUIDE on page 39 walks through common problems – low pressure, no drive, overheating. LUBRICATION on page 38 gives fluid type and capacity. Every step was written for the mechanic holding the wrench.

Does This Manual Cover the Valve Assembly and Brake Groups?

Yes. Sectional views show the Control Valve Assembly (Fig. F) and the Parking Brake Group (Fig. G). You also get the External Plumbing Diagram (Fig. H) and the Typical 3 Speed 18000 Cross Section (Fig. J). If you need to rebuild the valve body or service the parking brake, the factory drawings are right there. No aftermarket interpretation.

Disassembly of Transmission and Clutch Disassembly – Pages 1–22

The disassembly section breaks down the converter group, the transmission case, and the gear and clutch groups. Page 12 gets into the clutch group specifically – you’ll see the order of plate removal, the snap ring locations, and the clearance checks. Missing one snap ring lands you a comebacker. Follow the order in the manual.

3 Reasons to Choose OEM Documentation

First: torque specs. The SPECIFICATIONS AND SERVICE DATA on page 38 give you the bolt torques in lb-ft. Second: safety warnings. The manual tells you to lift the rear wheels or disconnect the driveline before towing – that’s on page 37. Third: parts approval. Only Clark-Hurth Components-approved parts should be used. The foreword is clear: use of non-approved parts voids any warranty.

Torque Specs and Pressure Check Points – Page 38 and 41

Page 38 lists all specification and service data – fluid capacities, pressure ranges, torque values. Page 41 shows the pressure check points. You hook up a gauge to those ports and verify the clutch engage pressures. If you are chasing a shift issue, start with the pressure check. The manual gives you the numbers. If you want to understand the power flow, flip to page 40 for the typical two and three speed power flow diagram. The CLUTCH AND GEAR ARRANGEMENT on page 42 shows which clutches engage for each speed. This manual is not a reprint. It’s the original Clark Equipment Company publication from 1993, with copyright dates 1991–1994. The OCR excerpt shows the foreword – it’s the real thing. Manual Transmission guides online won’t tell you the internal clearances. This one does.

For related factory manuals, check out the Spicer Clark-hurth HR Service Manual – Factory Specs for Heavy-Duty Transmission for heavier builds. If you work on smaller units, the Clark-hurth 55A SERIES II Service Manual – 136 Pages of Factory Specs is a solid reference. For later model coverage, the Clark-hurth SM-715, TMX12-25, EPX16-20s 2007 Service Manual – 502 Page OEM Facto includes a broader range.

Another thing: the manual covers lubrication requirements – SAE 10W or 30 engine oil depending on ambient temp. Manual Transmission fluid recommendations vary, but Clark-hurth wrote this one for a reason.

Is the towing procedure covered?

Yes, page 37.

What about the control valve?

The manual includes a full sectional view of the Control Valve Assembly (Fig. F) and the disassembly procedures for the valve body. It also shows the external plumbing diagram.

Can I use this for the 2-speed version?

The manual covers both 2 and 3 speed inline transmissions. The typical two and three speed power flow is diagrammed on page 40, and the clutch arrangement on page 42.

Are the specs in imperial units?

Yes, every torque spec, clearance, and pressure value is given in imperial (lb-ft, psi). Clark-Hurth built these for the North American market, so you won’t find metric conversions mixed in. The manual also lists lubrication requirements – SAE 10W or 30 engine oil depending on ambient temperature. The specifications and service data on page 38 include fluid capacities, pressure ranges, and torque values. Don’t try to substitute with generic transmission fluid. Stick with the factory data to avoid seal damage or clutch slip. If you have a pressure gauge, hook it up at the check points on page 41 and compare to the values in the table. That is the only way to confirm a rebuild.

If you are tearing down one of these transmissions, don’t waste billable hours guessing. Get the factory data that matches the hardware. Access the Factory Manual from AutoRepairManuals and keep it on your bench.