Bobcat 753 Hydraulic Pressure Switch Leak and Technical Overview

[MikePhua]

Component Function
The hydraulic pressure switch on the Bobcat 753 skid steer loader is a critical safety and system monitoring device designed to detect hydraulic oil pressure variations within the system. It typically mounts into the hydraulic filter housing, monitoring circuit pressures and sending signals to the loader’s control module and dashboard warning lights. A proper functioning pressure switch ensures hydraulic components operate safely and efficiently, preventing damage from low or abnormal pressure.
Technical Specifications

• Operating Pressure: 250 PSI typical switch activation
  
• Burst Pressure: Approximately 1250 PSI maximum
  
• Connection: 3-pin electrical connector for signal transmission
  
• Compatible Models: Bobcat skid steer loaders including 453, 463, 553, 653, 751, 753, 763, 773
  
• Threaded mount design for direct engagement with the hydraulic filter housing
  

Leakage Concerns and Typical Causes

• Seal deterioration or aging O-rings causing hydraulic fluid to leak externally.
  
• Cracks or physical damage to the pressure switch housing, often from impact or corrosion.
  
• Improper installation or over-tightening leading to thread damage or seal failure.
  
• Wear due to constant pressure cycles, especially in high-use or harsh working environments.
  

Replacement and Repair

• Part number 6670705 is a widely used and recommended replacement for Bobcat 753 hydraulic pressure switches.
  
• Replacement is generally straightforward and can be accomplished without special tools by removing the old switch from filter housing and installing the new one with appropriate torque to avoid leaks.
  
• It is advisable to replace the seal or O-ring concurrently to ensure proper hydraulic sealing.
  
• Replacing a leaking pressure switch often resolves related hydraulic warning lights and system pressure alarms.
  

User Experiences
Mechanics replacing the leaking pressure switch on Bobcat 753s report that this part often causes the hydraulic system warning light to illuminate. One technician noted that a leaking switch caused unintended shutdowns due to pressure monitoring faults, highlighting the importance of timely replacement. Prices for the pressure switch range around $60-$75 depending on vendor and warranty offers.
Maintenance Tips

• Periodically inspect the pressure switch area for signs of oil leaks.
  
• Avoid overtightening the switch during maintenance to preserve seal integrity.
  
• Use OEM or reputable aftermarket parts to ensure durability and fitment.
  
• Consider hydraulic system flush and filter replacement if leaks introduce contamination.
  

Glossary

• Hydraulic Pressure Switch: Sensor monitoring fluid pressure in hydraulic circuits, triggering alarms or shutdowns if abnormal.
  
• O-Ring: Circular sealing element preventing fluid leaks at connector joints.
  
• Filter Housing: The physical component holding hydraulic filters and associated sensors.
  
• Burst Pressure: Maximum pressure before mechanical failure occurs.
  
• Hydraulic Warning Light: Dashboard indicator alerting operator to system pressure abnormalities.
  

Summary
A leaking hydraulic pressure switch on the Bobcat 753 commonly results from worn seals or physical damage, impairing hydraulic system reliability and safety. Replacement with part 6670705 restores system integrity, eliminating leaks and erroneous warnings. Proper installation, routine inspections, and use of quality parts prolong switch life, ensuring seamless operation of critical hydraulic functions essential for Bobcat skid steer productivity.