Table of Contents
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U and G-SERIES SECONDARY
CONCRETE CRUSHERS
MODELS U21J, U21JR, U31J, U31JR
OPERATION AND MAINTENANCE MANUAL
© Copyright 2018 NPK Construction Equipment, Inc.
G Series Crushers Operation Manual 10-18
U45J, U45JR, G7, G18J, G26J, G30JR
"Use Genuine NPK Parts"
"Use Genuine NPK Parts"
7550 Independence Drive
Walton Hills, OH 44146-5541
Phone (440) 232-7900
Toll-free (800) 225-4379
Fax (440) 232-6294
www.npkce.com
U000-9600B U and
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Table of Contents
Related Manuals for NPK U21J
Summarization of Contents
Safety Information
Safety Notice Standards
Explains the meaning of DANGER, WARNING, CAUTION, and ATTENTION notices.
Operator Safety Decals
Details mandatory decals for operator awareness and their placement.
Operation and Maintenance Safety
General Operating Safety Rules
Critical safety guidelines for operating the crusher, covering debris, load handling, and equipment use.
Hydraulic System and Maintenance Safety
Precautions for hydraulic systems, hazardous fumes, and safe handling during maintenance.
Maintenance Standard Practices
Prevention of Contamination
Emphasizes protecting hydraulic equipment from contaminants during maintenance.
Component Handling and Assembly
Outlines best practices for component handling, marking, and cleaning during maintenance.
Introduction and Compatibility
Manual Introduction
Overview of the manual's purpose, safety, and NPK parts.
Excavator Compatibility
Guidance on matching the crusher to the carrier, considering weight and other factors.
Crusher Booster and Cylinder
Introduction to Booster System
Explains the function and benefits of the hydraulic booster system in NPK crushers.
Structure of the Boosted Cylinder
Details the components and assembly of the boosted cylinder system.
Hydraulic Installation
Hydraulic Kits and Flow Direction
Information on available hydraulic kits and the correct flow direction for crusher operation.
Shut-off Valves and Test Ports
Test Port Locations
Details on pressure test port locations for system checks.
Mounting Installation
Mounting Kit Components and Top Bracket
Lists parts included in mounting kits and describes the rotating top bracket features.
Mounting to the Carrier
Step-by-step instructions for attaching the crusher to the excavator carrier.
Operating Instructions
Safe Operating Procedures
Crucial warnings and guidelines to follow before operating the crusher.
General Maintenance
Daily Inspection and Maintenance
Daily checks and tasks required for proper crusher function and longevity.
Lubrication Points
Identifies all lubrication points and recommended greasing intervals for various models.
Cutter Blade Maintenance
Procedures for grinding, flipping, and replacing cutter blades for optimal performance.
Jaw Inspection and Maintenance
Weekly Inspection and Jaw Gap
Weekly checks for jaw wear and maintaining the minimum gap between fixed and movable jaws.
Teeth Maintenance and Rebuild
Procedures for teeth buildup, hardfacing, and replacement, including rebuild guidelines.
Troubleshooting
Identifying Power and Speed Issues
Classifies performance problems as loss of power or cycle speed and guides problem determination.
Relief Valve Checks and Settings
Procedures for checking and setting carrier and crusher relief valves to ensure proper operation.
Intensifier and Jaw Drift Issues
Guides for diagnosing intensifier malfunctions and jaw drift problems.
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