Understanding and Troubleshooting the Bobcat 773 Skid Steer

[MikePhua]

The Bobcat 773 is a versatile and widely used skid steer loader known for its powerful performance, agility, and range of attachments. It’s particularly popular in construction, landscaping, and other industries where compact machines are required to perform heavy lifting, digging, and material handling. However, like any piece of machinery, the Bobcat 773 can encounter mechanical issues over time, especially with regular wear and tear. In this article, we’ll dive into some common problems with the Bobcat 773, their potential causes, and how to resolve them.
Overview of the Bobcat 773 Skid Steer
The Bobcat 773 is a part of Bobcat’s popular 700 series of skid steers. It is equipped with a 49-horsepower, 4-cylinder diesel engine, and has a lift capacity of around 1,450 lbs. The 773 is known for its ability to tackle a wide range of tasks, including lifting, digging, and carrying heavy loads, while its compact size allows it to work in tight spaces.
The machine features a standard hydraulic system that powers its arms and attachments, making it ideal for heavy-duty tasks such as grading, excavation, and moving large amounts of material. With a smooth ride and reliable performance, the 773 is a workhorse for many industries, but it’s not without its challenges.
Common Problems with the Bobcat 773
Despite its durable design, the Bobcat 773 can experience several issues due to extended use and age. Operators frequently report certain problems that seem to be more common with this model. Here are a few of the most common issues, their causes, and how to address them.
1. Hydraulic System Problems
The hydraulic system on the Bobcat 773 plays a critical role in its operation. However, hydraulic failures are among the most common issues reported by owners of this machine.
Symptoms of Hydraulic Problems:

• Slow or unresponsive boom movements
  
• No lifting power in the bucket or arm
  
• Irregular operation of attachments powered by hydraulics
  

Possible Causes:

• Low hydraulic fluid levels
  
• Contaminated hydraulic fluid
  
• Faulty hydraulic pumps or valves
  
• Worn hydraulic seals or hoses
  

Resolution:
To diagnose hydraulic issues, start by checking the fluid levels and quality. If the fluid is low, top it up with the recommended hydraulic fluid. If the fluid looks dirty or contaminated, it’s time to replace it. Additionally, check the hydraulic hoses and seals for any leaks or damage that may be causing fluid loss. If necessary, replace the hydraulic pump or valves.
2. Engine Overheating
Engine overheating is another problem commonly encountered on the Bobcat 773, especially when the machine is under heavy load or used in hot weather.
Symptoms of Engine Overheating:

• The engine temperature gauge reading high
  
• Steam or smoke coming from the engine compartment
  
• Reduced engine power or stalling
  

Possible Causes:

• Dirty or clogged radiator
  
• Low coolant levels
  
• Faulty thermostat
  
• Blocked air intake system
  

Resolution:
Start by inspecting the radiator for dirt or debris that may be obstructing airflow. Clean the radiator thoroughly to ensure that it’s not clogged. Check the coolant levels and top them up if necessary. If the problem persists, the thermostat may need to be replaced, or there could be an issue with the water pump or cooling fan.
3. Electrical System Failures
Electrical problems can cause a range of issues on the Bobcat 773, from failure to start to malfunctioning lights and signals. Electrical problems are often tricky to diagnose, but they are common in older machines that have seen heavy use.
Symptoms of Electrical Problems:

• The machine won’t start
  
• Lights or gauges not working
  
• Fuses regularly blowing out
  
• Battery draining quickly
  

Possible Causes:

• Bad alternator or charging system
  
• Loose or corroded battery terminals
  
• Faulty wiring or connections
  
• Worn-out fuses or relays
  

Resolution:
Start by inspecting the battery and checking the terminals for corrosion or loose connections. If the battery seems weak, test the alternator to ensure that it's charging properly. Check for any broken or corroded wiring that could cause intermittent electrical failures. Replace any faulty fuses or relays, and if necessary, replace the alternator.
4. Transmission or Drive Motor Issues
Problems with the transmission or drive motors can cause the Bobcat 773 to lose power or function erratically.
Symptoms of Transmission or Drive Motor Problems:

• Slipping gears or difficulty shifting
  
• Unusual noises from the transmission
  
• Loss of power or jerky movement
  

Possible Causes:

• Low or contaminated transmission fluid
  
• Worn-out drive motor
  
• Faulty transmission linkage or gears
  

Resolution:
If you experience issues with the transmission, start by checking the fluid levels and condition. Low or dirty transmission fluid can cause the gears to slip or shift poorly. If the fluid is in good condition but the issue persists, it might be necessary to replace the drive motor or fix any damaged gears or linkages.
5. Cab and Control System Malfunctions
The Bobcat 773 is equipped with a joystick control system that allows operators to control the loader’s functions. Over time, this system can wear out, causing malfunctions or difficulty controlling the machine.
Symptoms of Control System Issues:

• Unresponsive joystick or control lever
  
• Difficulty moving the arms or bucket
  
• Sudden or erratic movements when operating
  

Possible Causes:

• Worn or damaged joystick controls
  
• Faulty electrical connections or sensors
  
• Hydraulic system issues affecting control functions
  

Resolution:
If the joystick is unresponsive, check for worn-out switches or damaged wiring. Replacing the joystick or its components can often solve this issue. If the issue is more complicated, such as erratic movements, it could be related to the hydraulic system. Check the hydraulic fluid and make sure that all hydraulic valves are functioning properly.
Preventive Maintenance for the Bobcat 773
To minimize the occurrence of these common issues, regular maintenance is crucial. Here are some preventive maintenance tips for the Bobcat 773:

• Hydraulic Fluid: Regularly check hydraulic fluid levels and replace the fluid as per the manufacturer’s recommendations. Clean filters and inspect for leaks.
  
• Engine Cooling: Keep the radiator clean and check coolant levels frequently, especially during hot weather or after heavy use.
  
• Battery and Electrical System: Inspect and clean the battery terminals, check the alternator’s performance, and replace any worn-out fuses or relays.
  
• Transmission Fluid: Check the transmission fluid levels and replace it if it appears dirty or low.
  
• Control System: Inspect and clean joystick controls, wiring, and connections regularly.
  

Conclusion
The Bobcat 773 is a reliable and robust skid steer loader that can handle a variety of tasks. However, like all heavy equipment, it requires regular maintenance and attention to keep it running at peak performance. By staying on top of common issues like hydraulic failures, engine overheating, electrical problems, and transmission issues, operators can ensure the longevity and efficiency of their machines. Regular inspections, proper fluid maintenance, and timely repairs can prevent many of these problems from escalating into costly repairs.