113-0061
Metering
Pump
(HMU)
Steering System Component for Caterpillar 938G II Wheel Loader
Product Overview
The 113-0061 PUMP GP-METERING -HMU is a crucial hydraulic metering unit designed specifically for the steering system of Caterpillar 938G II Wheel Loaders with Serial Numbers RTB1-UP. This high-quality component is an integral part of the 139-5953 LINES GP-STEERING assembly, ensuring precise and reliable hydraulic flow control for the machine's steering functions. Essential for smooth operation and safety, this metering pump plays a vital role in the loader's maneuverability and control.
Product Specifications
Part Number: 113-0061
Component Name: PUMP GP-METERING -HMU (Hydraulic Metering Unit)
Applicable Equipment: Caterpillar 938G II Wheel Loader
Applicable Serial Number Range: RTB1-UP
Part of Assembly: 139-5953 LINES GP-STEERING
Function: Provides precise hydraulic flow to the steering cylinders
Type: Gerotor or piston type metering pump (typical for HMUs)
System: Hydraulic Steering System
Key Features & Advantages
Precise Steering Control: Delivers accurate hydraulic flow proportional to steering wheel input, enabling smooth and predictable machine control.
Enhanced Safety: Reliable steering system components are paramount for operator safety and preventing accidents.
Durable Construction: Built to withstand the demanding conditions of heavy machinery operation, ensuring long service life.
Direct Fit: Engineered as a direct replacement for the specified Caterpillar 938G II models, simplifying installation.
Restores Performance: Replacing a worn or faulty HMU restores original steering responsiveness and efficiency.
Integral System Component: Designed to function seamlessly within the 139-5953 Steering Lines Group.
Applicable Equipment & Applications
This 113-0061 Metering Pump is specifically designed for the Caterpillar 938G II Wheel Loader, particularly models within the RTB1-UP serial number range.
Application Scenarios for 938G II Wheel Loaders:
Construction Sites: Loading trucks with materials like gravel, sand, and soil; site preparation; moving debris.
Material Handling: Loading and unloading various materials in ports, warehouses, and industrial yards.
Quarries and Mining: Handling extracted rock, aggregates, and ore; supporting drilling and blasting operations.
Agriculture: Moving feed, grain, fertilizer; handling large bales and other materials.
Road Building: Laying base materials; asphalt plant support; general site work.
Case Analysis:
Consider a 938G II operating in a busy construction yard with limited space. Precise steering is critical for navigating tight corners, maneuvering between obstacles, and accurately positioning the bucket for loading. A properly functioning 113-0061 HMU ensures the operator can make small, controlled steering adjustments, improving efficiency, reducing the risk of collisions, and allowing for faster cycle times. Conversely, a failing HMU can lead to stiff, erratic, or delayed steering, making the machine difficult and dangerous to operate, potentially causing delays and safety hazards on site. Replacing a worn HMU restores the machine's agility and operational safety.
Related Products & Applicable Equipment
Customers needing the 113-0061 HMU may also require other components within the steering or hydraulic system. Related products include:
Steering Cylinders: Actuate the steering linkage. (Applicable to 938G II and other CAT wheel loaders)
Steering Hoses and Fittings: Connect the HMU to cylinders and other hydraulic components. (Applicable to 938G II and various CAT equipment)
Steering Valves: Control hydraulic flow in some complex systems (though HMU often integrates this). (Applicable to various CAT hydraulic systems)
Hydraulic Oil Filters: Maintain system cleanliness. (Applicable to all CAT hydraulic equipment)
Hydraulic System Seals and Kits: For repairing leaks in pumps, cylinders, and valves. (Applicable to various CAT components)
Main Hydraulic Pump or Charge Pump: Provides pressure to the steering system. (Applicable to 938G II and other CAT machines)
These related parts often apply not only to the 938G II but also to other Caterpillar Wheel Loaders, Excavators, Dozers, and other heavy equipment utilizing similar hydraulic system designs and components.
Installation Tips & Troubleshooting
Proper installation is key to the performance and longevity of the 113-0061 HMU. Common issues and solutions include:
Problem: Erratic or no steering after installation.
Solution: Ensure the hydraulic system is properly bled to remove all air. Air in the system is a common cause of poor hydraulic performance. Follow the machine's service manual for the correct bleeding procedure.
Problem: Leaks at fittings or mounting points.
Solution: Verify that all hydraulic fittings are tightened to the manufacturer's specified torque. Use new seals and O-rings as required. Ensure the mounting surface is clean and flat.
Problem: Contamination in the hydraulic system leads to premature failure.
Solution: Thoroughly clean the surrounding area before beginning installation. Ensure all hoses and ports are clean. Consider flushing the hydraulic system and replacing filters if contamination is suspected or before installing a new critical component like an HMU.
Problem: Using the wrong type of hydraulic fluid.
Solution: Always use the specific type and grade of hydraulic fluid recommended in the Caterpillar 938G II service manual. Incorrect fluid can damage seals and internal components.
Problem: Incorrect alignment during mounting.
Solution: Ensure the HMU shaft is correctly aligned with the steering column linkage or motor connection (depending on system design) during installation to prevent binding or damage.
Always consult the official Caterpillar service manual for the 938G II Wheel Loader for detailed installation procedures and specifications.
