Fayat Group BOMAG BW 900-50

Questions and Answers

G
gmorrisAug 4, 2025
How to troubleshoot no or insufficient volumetric flow in Fayat Group BOMAG BW 900-50 Construction Equipment?
- V
  Virginia Keller MDAug 4, 2025
  If you're experiencing no or insufficient volumetric flow in your Fayat Group Construction Equipment, it might be due to several reasons. First, check and repair the mechanical drive, as a faulty coupling could be the cause. Also, ensure sufficient suction conditions by completely purging the axial piston unit and filling the suction line with pressure fluid. Make sure the pressure fluid is within the optimal viscosity range by using appropriate pressure fluid. Finally, check the external control and replace the axial piston unit if wear or mechanical damage is present.
F
foxmichaelAug 12, 2025
What to do if Fayat Group BOMAG BW 900-50 Construction Equipment has no or insufficient pressure?
- J
  John SimsAug 12, 2025
  If your Fayat Group Construction Equipment has no or insufficient pressure, start by checking and repairing the mechanical drive if there's a defective coupling. Ensure sufficient suction conditions by completely purging the axial piston unit and filling the suction line with pressure fluid. Use appropriate pressure fluid to maintain the optimal viscosity range. Check the external control and the pilot and control pressure. If the drive unit is defective, check it and replace it if necessary. If the axial piston unit is worn or mechanically damaged, replace it.
K
Karen FergusonAug 27, 2025
How to fix fluctuations in pressure/volumetric flow in Fayat Group BOMAG BW 900-50 Construction Equipment?
- N
  Nicholas RuizAug 27, 2025
  If you notice fluctuations in pressure or volumetric flow in your Fayat Group Construction Equipment, it could be due to the axial piston unit not being properly purged. Make sure to completely purge the axial piston unit. Another potential cause is insufficient suction conditions. In this case, completely purge the axial piston unit and fill the suction line with pressure fluid.
A
Austin Calhoun MDSep 10, 2025
Why is the pressure fluid too hot in my Fayat Group BOMAG BW 900-50 Construction Equipment?
- J
  Joy LeonSep 12, 2025
  If the pressure fluid is too hot in your Fayat Group Construction Equipment, check the system for issues like a cooler malfunction or low pressure fluid level in the tank. If the axial piston unit is worn, replace it.

Summary

General

Introduction

Manual's purpose, scope, and available documentation.

Safety Regulations

Important safety rules for repair and maintenance work.

General Repair Instructions

Guidelines for general repair processes and techniques.

Tightening Torques

Specifies torque values for various screw dimensions and types.

Technical Data

Presents physical dimensions, weights, drive, and engine specifications.

Maintenance

General Notes on Maintenance

Basic principles and safety for performing maintenance tasks.

Fuels and Lubricants

Details recommended engine oil, fuel, hydraulic oil, and grease.

Table of Fuels and Lubricants

A table listing required fuels and lubricants for various assemblies.

Running-in Instructions

Maintenance tasks for new or overhauled engines and machines.

Maintenance Table

A comprehensive table outlining maintenance tasks and intervals.

Overall View of Machine

Overview

Labeled diagram identifying major machine components.

Electrics

Starting with Jump Wires

Instructions for starting the machine using jump leads.

Engine Oil Pressure Monitoring

Explains the function of the oil pressure monitoring system.

Proximity Switches

Describes the function and types of proximity switches used.

Central Electrics

Details the central electrics module and its relays.

Control Elements

Identifies and describes the various control elements on the dashboard.

Fuses

Information on the fuse box, main fuse, and fuse ratings.

Engine

Engine Overview

Labeled diagram showing the engine components.

Checking the Engine Oil Level

Procedure for checking the engine oil level.

Changing Engine Oil and Oil Filter

Steps for changing the engine oil and oil filter.

Change the Fuel Pre-filter

Procedure for changing the fuel pre-filter.

Cleaning the Cooling Air Intake Openings

Instructions for cleaning air intake openings.

Check, Clean the Air Filter, Replace if Necessary

How to check, clean, or replace the air filter.

Clean, Check the Spark Plugs, Replace if Necessary

Procedure for cleaning, checking, or replacing spark plugs.

Checking, Adjusting the Valve Clearance

Steps for checking and adjusting valve clearance.

Check, Adjust the Idle Speed

How to check and adjust engine idle speed.

Checking Fuel Lines and Clamps

Procedure for inspecting fuel lines and clamps.

Engine Conservation

Measures for conserving the engine during long periods of inactivity.

Carburettor Check Sheet

A checklist for diagnosing carburetor issues.

Engine Problems

Lists common engine faults, possible causes, and remedies.

Hydraulics

Hydraulic Circuit

Explains open and closed hydraulic circuit principles.

Pump Overview

Identifies and describes the travel and steering/charge/vibration pumps.

Travel Pump, PMVO 13 S

Details the axial piston variable displacement pump (PMVO 13S1M).

Troubleshooting Axial Piston Pumps

A table for troubleshooting axial piston pumps.

Travel Motor TG405

Describes the TG405 gerotor motor used as a travel motor.

External Gear Motors

Explains the function of external gear motors.

External Gear Pumps

Explains the function and design of external gear pumps.

Steering Valve

Details the OSP steering unit and its components.

Travel Circuit

Explains the components and function of the travel circuit.

Vibration Circuit

Describes the vibration drive as an open hydraulic circuit.

Steering Circuit

Explains the steering circuit as an open hydraulic circuit.

Checking the Hydraulic Oil Level

Procedure for checking the hydraulic oil level.

Changing the Hydraulic Oil

Steps for changing the hydraulic oil and filter.

Checking the Hydraulic Oil Filter Element

Procedure for checking the hydraulic oil filter contamination indicator.

Change the Hydraulic Oil Filter

Steps for changing the hydraulic oil filter.

Tests and Adjustments

Special Tools

Lists special tools required for various tests and adjustments.

Checking the Rotation Speeds

Procedure for checking engine and exciter shaft rotation speeds.

Pressure Tests in the Travel Circuit

Steps for performing pressure tests in the travel circuit.

Adjusting the Neutral Positions of the Travel Pump

Procedure for adjusting the travel pump's neutral positions.

Travel Pump High Pressure Test

Procedure for testing the travel pump's high pressure output.

Pressure Tests in the Vibration Circuit

Steps for performing pressure tests in the vibration circuit.

Vibration Pump High Pressure Test

Procedure for testing the vibration pump's high pressure output.

Checking the Leakage Rate of the Vibration Motor

Procedure for measuring the vibration motor's leak oil rate.

Pressure Test in Steering Circuit

Steps for performing pressure tests in the steering circuit.

Flushing and Bleeding

Special Tools for Flushing

Lists special tools needed for hydraulic system flushing.

Flushing - General

General principles and procedures for flushing hydraulic systems.

Flushing Schematic for Travel System

Diagram illustrating the flushing setup for the travel system.

Flushing the Travel System

Detailed steps for flushing the travel system.

Bleeding the Travel Circuit

Procedure for bleeding air from the travel circuit.

Drum

Special Tools

Identifies a special tool for changing rubber buffers.

Repair Overview Vibrating Drum

Labeled diagram showing components of the vibrating drum for repair.

Removing and Installing the Vibrating Drum

Detailed steps for removing and installing the vibrating drum.

Dismantling the Vibrating Drum

Procedure for dismantling the vibrating drum assembly.

Assembling the Vibrating Drum

Steps for assembling the vibrating drum components.

Oscillating Articulated Joint

Repair Overview Oscillating Articulated Joint

Labeled diagram of the oscillating articulated joint for repair overview.

Removing and Installing the Oscillating Articulated Joint

Procedures for removing and installing the articulated joint.

Repairing the Oscillating Articulated Joint

Steps for dismantling and repairing the articulated joint.

Suppliers Documentation

Steering Valve

Details on the steering valve (OSPM type), including exploded views and part lists.

Circuit Diagrams

Hydraulic Diagram 138

The hydraulic schematic diagram for the machine.

Wiring Diagram 78

The electrical wiring diagram for the machine.