1998 Clark CMP 15/18 & CMP 20/25/30 Service Manual

Clark CMP 15–30 Forklift Service Documentation

• Covers 1998 Clark CMP 15, CMP 18, CMP 20, CMP 25, and CMP 30 industrial forklifts equipped with Mitsubishi 4G63 or 4G64 gasoline and LPG engines
• Official Clark publication SM 638, revision 1, published October 1998
• Contains 80+ pages of exploded-view assembly diagrams, maintenance checklists, engine tuning specifications, and torque settings
• Accessible from your device as soon as the order is placed
• Suitable for printing individual sections for shop-floor use
• This 1998 manual serves as the primary technical reference for the CMP-series engine overhaul, cooling, fuel, and transmission systems

Service and Maintenance Overview

This manual provides a structured approach to the maintenance and repair of the Clark CMP 15–30 forklift line. The content is organized by functional groups, beginning with safe maintenance practices, including lifting, jacking, and towing protocols for all specified models. The periodic service chapters detail maintenance schedules based on operating hours, including lubrication points, inspection intervals for LPG and gasoline fuel systems, and engine cooling requirements.

Additional chapters provide deep technical insight into the engine assembly, covering the 1998 Clark CMP 15–30 engine removal and installation, cylinder head and valve maintenance, and timing belt system requirements. The document documents critical engine overhaul specifications for the Mitsubishi 4G63 and 4G64 engines, including piston clearances, ring end gaps, and silent shaft bearing tolerances.

Engine and Technical Specifications

Engine tune-up data includes spark plug gap specifications of 0.7–0.8 mm (0.028–0.031 in) and a compression pressure reference of 1880 kPa (163.5 psi) at 300 rpm. The cooling system capacity for the 1998 Clark CMP 15–30 is documented at 8.5 liters. Specific torque values for upright trunnion bolts are set at 75–80 Nm (55–59 ft-lbs) to ensure structural integrity. Engine coolant thermostats are set to open at 82°C. All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. An official 281-page Clark OEM service manual covering the 1998 CMP 15/18/20/25/30 forklift series, providing detailed engine, fuel, and chassis diagnostic data for the Mitsubishi 4G63 and 4G64 power plant configurations.