Menzi Muck A91 - User Manual

Questions and Answers

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William KerrAug 6, 2025
Why won't my Menzi Muck A91 Excavators machine move?
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  luisgardnerAug 6, 2025
  If your Menzi Muck Excavators machine isn't moving at all, several factors could be at play. First, ensure the diesel engine is running; if not, consult the troubleshooting guide for the engine. Confirm that the armrest is fully closed and that the armrest switch is working correctly—replace it if necessary. Check for any blown main fuses and replace them. Make sure there's enough hydraulic oil in the system and that the pumps are properly vented. Also, verify that there's adequate pilot pressure by cleaning the supply pressure filter. Ensure the diesel engine speed is sufficient, noting that the maximum speed is 1450 rpm when the machine is cold or in emergency gas mode. Finally, measure the LS pressure and check for any loss of LS pressure.
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brooke46Aug 10, 2025
Why is the steering inoperable on my Menzi Muck A91?
- D
  Danielle IrwinAug 10, 2025
  If the steering on your Menzi Muck Excavators is inoperable, start by ensuring the steering switch is turned on. If that doesn't solve the problem, the changeover valve might not be switching correctly; consult the section on changeover valve issues. Also, a corroded changeover valve can cause this, so consider replacing it. Lastly, check for any blown fuses and replace them if needed.
A
Ashley JonesAug 15, 2025
What to do if the traction drive is inoperable on Menzi Muck A91?
- A
  adriennethomasAug 16, 2025
  If the traction drive on your Menzi Muck Excavators isn't working, make sure the traction drive fine control is not fully retracted; run it up to engage. Check for and replace any blown fuses. If a control is inoperable, read the fault from the display, check the connections, and replace any defective parts. Look for leaks in the system and fix them. If the brakes aren't disengaging, check the BR solenoid valve and the power supply to the support block for inadequate brake pressure. Ensure the wheel gear is coupled. Finally, inspect the release solenoid at the traction drive pump to ensure the traction drive pump swivels out correctly.
H
Henry MitchellAug 20, 2025
How to troubleshoot a support that won't move on Menzi Muck A91?
- M
  melissawoodsAug 20, 2025
  If the support on your Menzi Muck Excavators won't move, begin by checking for and replacing any blown fuses. If the CAN bus is inoperable, read the fault from the display, check the connections, and replace any defective parts. Inspect the LS solenoid valve on the support block, checking both the solenoid valve and its power supply. Also, check other solenoid valves on the support block and their power supply. Finally, measure the LS pressure and rectify any LS pressure loss.
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brockchristopherAug 26, 2025
What to do if the bucket won't move on Menzi Muck A91?
- A
  Alexa OwensAug 26, 2025
  If the bucket on your Menzi Muck Excavators won't move, first ensure the steering switch is set to the bucket position (switched off). If that's not the issue, the changeover valve piston may be jammed or clogged; remove the changeover valve, strip it down, and clean it. Alternatively, the changeover valve might be corroded, in which case you should replace it.
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Brian BrownAug 30, 2025
Why does actuating the traction drive increase the engine speed on my Menzi Muck A91?
- R
  Ryan BrennanAug 30, 2025
  If actuating the traction drive increases the engine speed on your Menzi Muck Excavators, the automatic drive may be activated. Deactivate the automatic drive by setting the bucket steering switch to the first position.

Summary

1. General Information

1.1 Explanation of Symbols

Explains safety and warning symbols used in the manual for hazard identification.

1.2 Information on the Operators Manual

Guidance on reading and understanding the manual for safe and correct machine operation.

1.3 Limitation of Liability

Manufacturer's disclaimer regarding damages from improper use, modifications, or non-compliance.

1.4 Copyright Information

Details copyright protection and restrictions on manual usage and distribution.

1.5 Spare Parts Guidance

Information on using genuine spare parts to ensure correct function, safety, and longevity.

1.6 Disposal of Materials

Guidelines for separating and recycling or disposing of dismantled machine components.

1.7 Type Plate Identification

Describes the essential information found on the machine's identification type plate.

1.8 EC Declaration of Conformity

Declares the machine's conformity to relevant EU directives and safety standards.

2. Safety Procedures

2.1 General Safety Principles

Overview of key safety aspects for personnel protection and safe, trouble-free machine operation.

2.2 Warning Symbols and Locations

Identifies the location and provides the meaning of all warning symbols on the machine.

2.3 User Roles and Responsibilities

Defines the distinct roles and associated responsibilities for owners, operators, and mechanics.

3. Technical Data

3.1 Machine Dimensions

Provides detailed dimensional data (length, height, width) for various Menzi Muck models.

3.2 Machine Weights

Lists the operational weights of different Menzi Muck models without accessories.

3.3 Engine Specifications

Details engine model, emissions, displacement, power output, and related technical data.

3.4 Hydraulic System Overview

Describes the machine's hydraulic system components, pressures, and capacities.

3.5 Drive System Specifications

Outlines drive types, maximum speeds, and climbing abilities for various models.

3.6 Tire and Wheel Specifications

Lists tire dimensions, rim sizes, and recommended air pressure settings.

3.7 Noise Emissions Data

Specifies sound power and pressure levels according to applicable EU environmental standards.

3.8 Forces and Lifting Diagrams

Presents lifting force diagrams and operational force data for different boom configurations.

3.9 Available Accessories

Lists various attachments with their specifications, capacities, and weights.

4. Machine Structure and Components

4.1 Menzi Muck A91 Mobil Component Identification

Identifies and labels the main structural components of the A91 Mobil model.

4.2 Menzi Muck A91 4 x4 Structure

Identifies and labels the components of the A91 4x4 with lift axle and steered hub drive.

4.3 Menzi Muck A91 4 x4 Plus Structure

Identifies and labels the main structural components of the A91 4x4 Plus model.

4.4 Menzi Muck A91 4 x4 Plus Sensor Structure

Identifies and labels the components of the A91 4x4 Plus Sensor model.

5. Transport, Packaging, and Storage

5.1 Safety Instructions for Transport

Provides critical safety warnings and precautions related to transporting the machine.

5.2 Transporting the Machine by Truck

Details procedures and safety measures for loading and transporting the machine via truck.

5.3 Lifting the Machine Safely

Outlines safety instructions and precautions to follow when lifting the machine.

5.4 Transport Inspection Procedures

Instructions for checking the machine's completeness and for any damages upon receipt.

5.5 Packaging Guidelines

Information on how the machine and its components are packaged for protection.

5.6 Machine Storage Recommendations

Guidance on storing the machine when decommissioned for extended periods, protecting from weather.

6. Control and Display Elements

6.1 Operators Workplace Layout

Describes the arrangement of controls, instruments, and seating in the operator's cabin.

6.2 Main Power Switch Operation

Instructions for operating the main power switch and its safety implications.

6.3 Display Unit Functions and Controls

Details the functions of the display, ignition lock, and various switches for machine operation.

6.4 Joystick Control Assignments

Explains the functions of the left and right joysticks for precise machine control.

6.5 Pedal Controls and Assignments

Describes the function and assignment of the accelerator and other foot pedals for machine operation.

6.6 Adjusting Operator Controls

Guidance on adjusting the seat, armrests, and controls for optimal ergonomics and comfort.

6.7 Cab Windows and Door Operation

Instructions for opening, closing, and securing cab windows and doors for access and safety.

6.8 Machine Covers and Access

Procedures for opening and closing various machine covers for maintenance and inspection.

6.9 Refuelling System Operations

Step-by-step guide for filling the main and chassis diesel tanks safely and correctly.

6.10 Tilting the Operator Cab

Instructions and safety precautions for tilting the operator's cab for maintenance access.

7. Working with the Machine

7.1 Safety Instructions for Operation

General safety warnings and precautions to ensure safe operation of the machine.

7.2 Intended Use and Operating Conditions

Defines the machine's intended applications and safe operating environments.

7.3 Commissioning Procedures

Information on pre-operation checks and the correct commissioning process for the machine.

7.4 Operating the Upperstructure

Explains how to operate the machine's upperstructure movements safely and effectively.

7.5 Chassis Control and Steering Modes

Details how to control the chassis and select different steering modes for various terrains.

7.6 Driving Operations

Instructions for driving, braking, and steering the machine safely in different conditions.

7.7 Hydraulic Auxiliary Connections

Describes the operation of hydraulic auxiliary connections and powerline functions.

7.8 Operating Attachments

Instructions for attaching and operating various machine accessories and attachments.

8. Maintenance and Care

8.1 Safety Instructions for Maintenance

Critical safety guidelines to follow during all maintenance activities to prevent accidents.

8.2 Machine Position for Maintenance

Guidelines for safely positioning the machine before performing maintenance or checks.

8.3 Maintenance Intervals Schedule

Provides a detailed schedule for regular maintenance tasks based on operating hours or time.

8.4 Lubricant Specification Table

Lists recommended lubricants, their types, and capacities for various machine parts.

8.5 Engine and Air-conditioning Maintenance

Covers maintenance procedures for the engine, cooling, and air conditioning systems.

8.6 Heating;Air Conditioning System Servicing

Details maintenance procedures for the heating and air conditioning components.

8.7 Gearbox and Drive Maintenance

Procedures for checking and maintaining wheel hubs, swing gear, and pump transfer gear.

8.8 Hydraulic System Maintenance

Covers checking and changing hydraulic oil and filters for optimal system health.

8.9 Electric System Maintenance

Information on maintaining the battery, fuses, relays, and other electrical components.

9. Faults and Fault Rectification

9.1 Engine Troubleshooting Guide

Lists common engine faults, their causes, and recommended remedies for quick diagnosis.

9.2 General Machine Troubleshooting

Addresses issues related to the entire machine, including drive, steering, and control systems.

10. Notes for Spare Part Orders

11. Warranty Provisions

12. Appendix

Menzi Muck A91 Specifications

General

Brand	Menzi Muck
Model	A91
Category	Excavators
Language	English

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