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Stanley MB556 - User Manual

Stanley MB556
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© 2015 STANLEY Black & Decker, Inc.
New Britain, CT 06053
U.S.A.
56598 3/2020 Ver. 20
USER MANUAL
Safety, Operation and Maintenance
MB556
MOUNTED
HYDRAULIC BREAKER

Questions and Answers

  • S
    Shaun WolfAug 4, 2025
    Why won't my Stanley MB556 Circuit breakers fire?
    • D
      Daniel CarlsonAug 4, 2025
      If your Stanley Circuit breakers won't fire, it could be due to several reasons: * Low hydraulic oil level: Fill the reservoir. * Damaged quick couplers: Replace them. Other potential causes include no flow to the breaker, a main relief set too low, or internal damage. In these cases, have the hydraulic circuit or unit serviced by an authorized dealer/distributor.
  • T
    tiffanymillerAug 9, 2025
    Why is my Stanley Circuit breakers running slowly?
    • M
      Melissa NealAug 9, 2025
      If your Stanley Circuit breakers are running slowly, it could be due to low hydraulic flow. Have the hydraulic circuit tested by an authorized dealer/distributor per approved procedure. Other possible causes include excessive heat build-up, excessive nitrogen pressure, or internal leakage. For excessive nitrogen pressure, have the unit serviced by an authorized dealer/distributor.
  • S
    Shaun StoneAug 14, 2025
    Why does the hydraulic system of my Stanley MB556 Circuit breakers overheat?
    • M
      Michelle MayAug 14, 2025
      If the hydraulic system of your Stanley Circuit breakers overheats, it could be due to a main relief set too low. In this case, have the unit serviced by an authorized dealer/distributor. Other potential causes include insufficient cooling capability in the hydraulic circuit, line/hose size being too small, or excessive back-pressure.
  • N
    nwrightAug 25, 2025
    Why is my Stanley MB556 running but at reduced power?
    • A
      Andrew GloverAug 25, 2025
      If your Stanley Circuit breakers are running but at reduced power, a possible cause is a low accumulator charge. Have the unit serviced by an authorized dealer/distributor. Other potential causes include excessive back-pressure or a relief set too low.
  • J
    Jason BrownAug 28, 2025
    What to do if Stanley MB556 Circuit breakers leaks oil around tool bit and tool bushing?
    • K
      Kelsey MayAug 28, 2025
      If your Stanley Circuit breakers are leaking oil around the tool bit and tool bushing, it is likely due to failed lower seals. Have the unit serviced by an authorized dealer/distributor to address this issue.
  • M
    Mr. Manuel RobbinsSep 10, 2025
    What to do if my Stanley MB556 Circuit breakers runs erratically?
    • W
      walvarezSep 12, 2025
      If your Stanley Circuit breakers are running erratically, it could be due to low or excessive back-pressure. Have the carrier serviced by an authorized dealer/distributor. Another cause may be tool binding, in which case you should add grease to the tool shank and avoid prying while operating.

Summary

SAFETY SYMBOLS

Local Safety Regulations

Space to enter local safety regulations for accessible keeping.

SAFETY PRECAUTIONS

General Warnings and PPE

Critical warnings on projectiles, bystanders, and mandatory personal protective equipment.

SAFETY PRECAUTIONS (Continued)

Operator Training and Conditions

Operator training, work condition knowledge, and safety rules adherence.

SAFETY PRECAUTIONS (Continued)

Operational Limits and Maintenance Safety

Operational limits, tool bit usage, and authorized repair personnel requirements.

TOOL STICKERS & TAGS

Decal Identification

Identifies decals for sound power, CE specs, warnings, and specialized stickers.

OPERATION

Pre-Installation & System Testing

Pre-installation checks, hydraulic system testing, and tool bit lubrication.

OPERATION - CARRIER POSITIONING

Securing Tool Bit & Warm-Up

Securing the tool bit and performing low-temperature warm-up procedures.

Skidsteer Loader Positioning

Positioning skidsteer loaders for optimal breaker operation.

OPERATION - BREAKING TECHNIQUES

Backhoe & Excavator Positioning

Positioning backhoes and excavators for effective breaker use.

Breaking and Down Pressure

Maintaining down pressure and positioning for efficient breaking.

OPERATION - BREAKING METHODS

Breaking Techniques & Binding

Breaking techniques, repositioning, and preventing tool bit binding.

OPERATION - HAZARDS

Blank Firing and Underwater Use

Warnings on "blank firing" hazards and damage from underwater usage.

OPERATION - UNDERWATER USE

Bit Greasing and Air Supply

Bit greasing and air supply requirements for underwater operation.

TROUBLESHOOTING

Common Problems and Solutions

Diagnosing and resolving common breaker problems with causes and solutions.

MAINTENANCE

Daily Checks and Wear Inspection

Routine checks for fasteners, leaks, and wear on tool stop/bushing.

CHARGING THE ACCUMULATOR

Charging Procedure and Specifications

Step-by-step instructions for charging accumulators and their pressure specifications.

FLOW CONTROL KIT INSTRUCTIONS

Installation and Hose Routing

Guides on installing the flow control kit and proper hose connections.

WEAR TOLERANCES

Component Wear Limits

Specifies new and reject limit dimensions for bushings, tool stop, pins, and piston.

PROPER USE & CARE OF TOOL BITS

Tool Bit Damage and Metal Contact

Common causes of tool bit damage, including metal-to-metal contact.

PROPER USE & CARE OF TOOL BITS (Continued)

Prying, Corrosion, and Mushrooming

Failures from prying, corrosion, lubrication, and heat-induced mushrooming.

PROPER USE & CARE OF TOOL BITS (Continued)

Material Flaws and Bit Types

Warranty-covered internal flaws and selection of Moil, Chisel, Blunt bits.

FLOW TEST PROCEDURES

Flow and Heat Load Testing

Procedures for testing hydraulic flow, back-pressure, and heat load.

FLOW TEST PROCEDURES (Continued)

Flow Test Troubleshooting

Issues like non-actuating valves and incorrect voltage during flow testing.

DEFINITIONS

Hydraulic Terminology

Defines terms for tool operation, pressure, flow, and hydraulic lines.

SPECIFICATIONS

Dimensions, Weights, and Torque

Physical specs, operating parameters, and torque values for components.

ACCESSORIES

Tool Bits and Miscellaneous Items

Available tool bits and other accessories like charge kits and adapters.

MB556 POWER CELL ILLUSTRATION

Power Cell Components Diagram

Illustrated diagram of the numbered power cell components.

HOUSING PARTS ILLUSTRATION

Housing Components Diagram

Illustrated diagram of the numbered breaker housing components.

MB556 PARTS LIST

Comprehensive Parts Listing

Detailed table of parts with numbers, quantities, and descriptions.

MB55600 SS ILLUSTRATIONS

MB55600 SS Component Diagrams

Diagrams illustrating assemblies and components for the MB55600SS model.

MB55600 SS PARTS LIST & MOUNTING BRACKETS

Parts List and Mounting Brackets

Parts for MB55600SS and mounting brackets with diagrams.

Stanley MB556 Specifications

General IconGeneral
BrandStanley
ModelMB556
CategoryCircuit breakers
LanguageEnglish