CLARK GTS 20, 25, 30, 33D & GTS 20, 25, 30, 33L Forklift Service Manual

Description

CLARK GTS 20/25/30/33D & GTS 20/25/30/33L Service Manual

The CLARK GTS 20/25/30/33D & GTS 20/25/30/33L Service Manual is a comprehensive workshop reference for CLARK forklift trucks with rated capacities from 2,000 to 3,300 kg. The supplied sample identifies this manual as Book No. SM 783, Revision 4.8, Part No. 8067002, dated January 2021.

Designed as a technical service reference, this manual is useful for technicians and maintenance personnel working on CLARK GTS-series lift trucks. It organizes service information into dedicated groups covering the engine, cooling system, transmission, electrical system, drive axle, wheels and tires, brakes, steering, hydraulic system, tilt cylinders, upright assembly, chassis and specifications.

Models Covered

• CLARK GTS 20D
• CLARK GTS 25D
• CLARK GTS 30D
• CLARK GTS 33D
• CLARK GTS 20L
• CLARK GTS 25L
• CLARK GTS 30L
• CLARK GTS 33L

Manual Specifications

Engine Information

The contents section identifies engine coverage for both diesel and LPG configurations. The diesel engine references include YANMAR 4TNE94L and YANMAR 4TNE98, while the LPG configuration references the HMC THETA 2.4 engine.

Major Service Sections

The manual is structured into clearly identified service groups. These include Safe Maintenance, Periodic Service, Engine, Cooling System, Intake and Exhaust System, Transmission, Electrical System, Drive Axle, Wheels and Tires, Brake System, Steering Column and Gear, Steer Axle, Hydraulic Pump/Sump/Filters, Hydraulic Control Valve/Lift Circuit, Tilt Cylinders, Upright, Counterweight and Chassis, and Specifications.

The contents diagram in the sample provides an illustrated overview of the major forklift systems and their corresponding service manual groups, making it easier to locate the relevant maintenance section.

Safety and Workshop Procedures

The Safe Maintenance section provides important workshop procedures covering safe parking, lifting, jacking and blocking the truck, raising drive wheels, raising the truck with a hoist, blocking the upright in the raised position, raising the rear or entire truck, shipping tie-down procedures, and towing a disabled forklift.

The manual emphasizes correct lifting equipment, proper blocking locations, safe working conditions and inspection procedures before maintenance operations. These procedures are particularly useful when carrying out major component service or accessing areas beneath the forklift.

Periodic Service & Planned Maintenance

A substantial part of the sample is dedicated to periodic servicing and the CLARK Planned Maintenance Program. Maintenance schedules are organized around operating-hour intervals including 8–10 hours/daily, 450–500 hours/6 months, 900–1000 hours/12 months, and 2000 hours/1 year.

The service schedules cover inspections, lubrication, fluid and filter service, engine checks, cooling-system maintenance, transmission service, electrical inspections, drive axle maintenance, tires and wheels, brake system checks, steering components, hydraulic systems, tilt cylinders and upright components.

Engine, Transmission & Cooling Service

Engine-related maintenance information includes oil service, filters, idle and governed RPM checks, fuel-system inspection, diesel injectors, LPG components, ignition-related checks where applicable, throttle linkage and other periodic engine service tasks.

The cooling-system section includes coolant level and condition checks, coolant protection testing, coolant replacement, hose inspection, fan and belt inspection, radiator maintenance, thermostat testing and water-pump checks.

Transmission service information includes fluid condition and level checks, fluid replacement, filter service, pressure checks, charging-pump and clutch-pack testing where applicable, inching operation and transmission cooler/line inspection.

Hydraulic, Steering & Lift System Maintenance

The service schedules include hydraulic fluid inspection and replacement, hydraulic filter service, suction-screen cleaning, tank breather maintenance and hydraulic relief-pressure testing. The manual also covers tilt-cylinder adjustment, mounting, rod ends and seal inspection.

Upright and lift-system maintenance includes carriage and lift-chain lubrication, chain inspection and adjustment, fork and latch inspection, load-backrest inspection, upright rollers, mounting bolts and lift-cylinder checks.

Electrical, Brake, Axle and Wheel Service

Electrical maintenance tasks include hourmeter and indicator-light checks, wiring-harness inspection, alternator inspection/testing, battery condition checks and starter-system testing. Brake-related procedures include brake operation, brake-line inspection, parking-brake adjustment and service-brake wear checks.

The manual also includes service information for the drive axle, steer axle, wheel bearings, wheel mounting hardware and tire condition/pressure. This makes the document useful as a general workshop reference for routine forklift maintenance.

Detailed Visual Inspection

The Planned Maintenance section includes a systematic visual inspection approach. The sample specifically illustrates inspection of decals and fasteners, leaks, overhead guard components, carriage, load backrest, upright, lift chains, cylinders and forks.

The manual also provides inspection guidance for fork wear and other safety-critical components, helping technicians identify maintenance issues before returning a forklift to service.

Why This Manual Is Useful

• Comprehensive reference for CLARK GTS-series forklift maintenance.
• Covers both diesel and LPG configurations identified in the manual.
• Includes safe maintenance, lifting, blocking and towing procedures.
• Provides periodic service and planned maintenance schedules.
• Covers engine, transmission, cooling, electrical, hydraulic, brake and steering systems.
• Includes upright, lift cylinder, carriage, forks and lift-chain service information.
• Useful for workshop technicians and professional maintenance personnel.
• Digital PDF format for convenient workshop reference.

Manual identification: CLARK Service Manual SM 783, Revision 4.8, Part No. 8067002, January 2021. The supplied sample confirms the model range and technical sections described above. :contentReference[oaicite:0]{index=0}