SHIBATA GRK5 - User Manual

This manual describes the GRK5 Ultimate Performance RC car, covering its assembly, operation, maintenance, and technical specifications.

Function Description

The GRK5 is a high-performance remote-controlled car designed for enthusiasts, particularly for drifting. It is built with precision components to deliver "Ultimate Performance," as indicated by its branding. The car's design emphasizes adjustability and durability, allowing users to fine-tune its performance characteristics for various driving conditions and preferences.

Important Technical Specifications

The GRK5 utilizes a range of specialized components, including:

• Drivetrain: Features a ball differential with a 39T ring gear, ensuring smooth power delivery. It includes diff joints (long and short) and a diff spring for optimal differential action. The gear system incorporates a high-precision cutting spur gear (48p 76T) and a 12T bevel pinion gear, housed within an aluminum gearbox for durability and heat dissipation.
• Bearings: Equipped with various ball bearings for smooth operation, including 850 (2.5mm), 1510 (4mm), 1280 (3.5mm), 940 (4mm), and 1060 (3mm) sizes. Thrust bearing washers are also used in the differential assembly.
• Chassis and Suspension: The chassis is a GRK5 Lower Deck (main chassis) with an adjustable suspension system. It features aluminum suspension mounts, front and rear upper arm mounts, and a motor mount bridge. The suspension includes adjustable suspension blocks (C, L, R), various pivot balls (SL, MM, SS), and turn-buckle shafts (36mm Ti, 20mm Ti) for precise alignment. Suspension pins come in 2.5x49.0mm and 2.5x52.8mm sizes.
• Steering: The steering system incorporates a GRK5 Steering Rack, steering rack mount base, mount plate, and upper plate. It uses rail rack bearing bushes and a multi-angle steering knuckle system (L and R) with adapters for enhanced steering precision and adjustability.
• Shocks: The car is equipped with 30mm HDFC shock piston rods, shock coil springs, and W207 shock cylinders. It features shock upper mounts, X-rings, diaphragms, and adjustable spring adjusters. Shock lower caps and cylinder caps are also included.
• Brakes (Simulated): The GRK5 includes simulated brake rotors (L and R) and big brake calipers, enhancing its realistic appearance.
• Body and Accessories: Features GRK5 nose cones (L and R), a GRK5 rear fin plate, and a GRK5 CFRP bumper plate. Body mount supports and posts are included for attaching the car body.
• Fasteners and Spacers: A wide array of screws (button head, countersunk head, flat head, set screws), nuts (nylon), and aluminum spacers (various sizes like 3.0x1mm, 3.0x2mm, 3.0x3mm, 3.0x4mm, 2.6x0.5mm) are used throughout the assembly. O-rings are also utilized for sealing and cushioning.
• Battery System: Includes aluminum battery hold-down posts and separate battery holders/plates.

Usage Features

• High Speed Capability: The GRK5 can reach speeds exceeding 40km/h, emphasizing the need for safe operating environments.
• Adjustability: Many components, particularly in the suspension and steering, are designed for adjustment, allowing users to customize the car's handling characteristics. This includes adjustable shim quantities in the differential, various gear ratios, and adjustable suspension blocks.
• Performance Optimization: The manual highlights the importance of adjusting gear clearance for smooth operation and optimal motor performance.
• Safety Guidelines: Emphasizes the importance of adult supervision for younger users, assembly in safe environments (away from small children), and careful handling of sharp tools and components. It also warns against running the car on public roads, in areas with high traffic, or in wet conditions due to potential damage to electronics and loss of control.
• Radio Control: Operates via radio frequency, requiring users to confirm frequencies with other RC car users to prevent interference.
• Cooling: Advises allowing components like the motor and drivetrain to cool sufficiently after use to prevent damage and prolong their lifespan.

Maintenance Features

• Regular Inspection: Users are advised to check contents carefully before assembly and contact customer support for any defective or missing items.
• Lubrication: The manual specifies the use of black grease for differential assembly and silicone grease for other moving parts, ensuring smooth operation and reducing wear.
• Battery Care: Detailed instructions for battery charging (safe location, monitoring, stopping if temperature exceeds 50°C), cooling after use, and proper disposal are provided. Using a battery conditioner is recommended to prolong battery life and performance.
• Motor Care: Recommends selecting an appropriate gear ratio to match motor characteristics and allowing the motor to cool between runs to prevent damage.
• Component Replacement: The manual implicitly supports component replacement through its detailed parts lists and assembly diagrams.
• Tool Requirements: Lists essential tools for assembly and maintenance, including screwdrivers (+ #1), hex wrenches (1.5mm, 2.0mm), long nose pliers, socket drivers (5.5mm, 7.0mm), and wire cutters.
• Threadlocker Application: Notes that threadlocker should be applied to specific screws (e.g., 3-1* screw in BAG 3) to prevent loosening during operation.
• Body Shell Adjustment: Instructions are provided for adjusting body post positions to fit the body shell correctly.
• Deep Part Insertion: For certain assemblies (e.g., shock pistons), users are instructed to "set the parts deeply inside" to ensure proper fit and function.
• Tightening Caution: Warnings are given against over-tightening screws, particularly for shock components, to avoid damage.