Description

Clark-hurth 25, 30, 15, 18, 20 1998 Service Manual

You’ve got a CMP 15/18/20/25/30 in the bay that needs a transaxle rebuild or an engine overhaul. Aftermarket manuals give you generic specs and half-assed wiring diagrams. This factory book came from Clark’s own technical publications in Lexington, KY – Clark-hurth 25, 30, 15, 18, 20 1998 Service Manual – and every torque sequence, every shim dimension, every diagnostic chart is what the dealers used. No third-party copy. Original OEM print.

Engine Overhaul Coverage: From Timing Belt to Crankshaft

Group 00 is 281 pages of dense, procedural work. Section 8 alone walks through timing belt removal and inspection, rocker arm lash adjuster leak-down tests, and cylinder head installation service points. The manual specifies the tightening method for permanently yielding bolts – something aftermarket books skip. You get the exact sealant specs and special tool numbers. If you’re pulling the head on a CMP 25, the sequence and torque angles are right there. Page 1 shows the full table of contents layout; use the Group-Section-Page numbering (like 00-8-14) to jump straight to the overhead cam or silent shaft inspection.

Transaxle Overhaul: Factory Procedure for Differential and Clutch

Group 06 covers the complete transaxle – removal, disassembly, differential and clutch assemblies, brake adjustment. The diagnostic guide includes converter stall procedure and pressure checks. No guesswork on shim stacks or clutch pack clearances. Section 2 gives a troubleshooting chart that walks you through hydraulic and mechanical issues. For a CMP 18 with a slipping clutch, you follow the inspection steps and assembly tolerances from the OEM data. Related: CLARK 12 25 Technical Manual covers smaller models; CLARK 25 30 36 Service Manual handles the bigger units.

Does This Manual Cover LPG and Gasoline Fuel Systems?

Group 02 splits into two sections. Section 1 covers LPG – idle air fuel adjustment, power adjustment, carburetor overhaul, vapor regulator overhaul. Section 2 covers gasoline – carburetor specs, idle speed adjustment, fuel pump removal and installation. Both sections include disassembly and assembly procedures with inspection steps. If you’re converting a CMP 20 from gasoline to LPG, the manual gives the OEM adjustment values. No need to cross-reference with generic charts.

Planned Maintenance: A System That Prevents Downtime

The Periodic Service group (pages starting at 00-1-2 reference) contains the planned maintenance program. It lists PM intervals, a visual inspection checklist, functional tests, upright and tilt cylinder lubrication points, fluid checks, and critical fastener torque checks. The PM form on page 00-1-2 is a reproducible template. Use it to track every service interval. Clark designed this for fleet maintenance – you can adapt it for your shop. For more on heavy-duty transmission service, check Spicer Clark-hurth HR Service Manual – Factory Specs for Heavy-Duty Transmission.

Safety and Lifting: Group SA Keeps You Alive

Group SA is the first section – Safe Maintenance. It covers safe parking, lifting, jacking and blocking points, raising drive wheels off the floor, blocking the upright in raised position, towing procedures, and shipping tie-down instructions. If you’re lifting a CMP 20 with a hoist, the manual shows the designated lift points. These are not suggestions – they are Clark’s engineering safety standards. Ignoring them can crush a technician. Read Group SA before you even crack open the engine section.

3 Reasons to Choose OEM Documentation Over Aftermarket

First, aftermarket manuals often reprint outdated scans with missing pages. This 1998 Service Manual is a clean original file with all 281 pages intact. Second, OEM torque specs come from Clark’s engineering – not a generic database. Third, the wiring diagrams in Group 14 are circuit-specific to these CMP models. For an overview of manual transmission basics, see Manual Transmission on Wikipedia. The overhaul procedure assumes you understand Manual Transmission fundamentals; the manual fills in the Clark-specific details.

You have a lift truck that earns money when it runs. Aftermarket manuals waste time with wrong specs. This factory service manual gives you the exact data Clark used for warranty repairs. Stop fighting with reprints. Get the real thing. Access the Factory Manual.

What models does this manual cover?

CMP 15, 18, 20, 25, and 30.

Does it include torque specifications for critical fasteners?

Yes. The Periodic Service group covers Critical Fastener Torque Checks for all major assemblies. The engine overhaul section (Group 00) specifies tightening sequences for cylinder head bolts and the correct angle torque for yielding bolts. The transaxle overhaul section includes bolt torques for the differential housing and clutch pack. The steer system section has specs for cylinder gland nuts and priority valve mounting. All these values come from Clark’s factory engineering data, not a generic table. Using wrong torque can cause oil leaks, gear misalignment, or sudden failure under load. This manual gives you the exact numbers, plus the tightening method (turn angle or lb-ft) to apply.