20/03/2021
The Case 85XT skid steer loader is a robust and versatile piece of machinery, crucial for a wide array of tasks in construction, agriculture, and landscaping. To ensure its longevity and optimal performance, understanding its maintenance requirements is paramount. This guide delves into the essential aspects of maintaining your Case 85XT, drawing from official service manual information to provide a detailed and practical resource.
Understanding the Case 85XT Skid Steer
The Case 85XT, along with its counterparts the 90XT and 95XT, is powered by a reliable 239 cu.in (3.9L) Case 4-390 4-stroke, 4-cylinder direct injection naturally aspirated diesel engine. This powerhouse delivers a rated power of 80 hp (59.7 kW) at 2200 rpm, ensuring ample strength for demanding jobs. Key features include a hydrostatic transmission for smooth operation, 100HS continuous roller chains for durability, a vertical-lift boom for extended reach, and standard 12x16.5 tyres. The machine boasts a rated operating capacity of 2400 lbs (1090 kg) and a tipping load of 4800 lbs (2180 kg), making it a capable workhorse. Furthermore, its boom lifting force is an impressive 4935 lbs (2245 kg), and the bucket breakout force stands at 6175 lbs (2805 kg).
The Heart of the Machine: Hydraulic Components Explained
The hydraulic system is the lifeblood of any skid steer, and understanding its components is crucial for effective maintenance. The Case 85XT's hydraulic system is an open-centre type, featuring several key elements:
Reservoir
The hydraulic system commences at the reservoir, strategically located in the left rear of the chassis. This reservoir has a substantial capacity of 66.2 litres (17.5 U.S. gallons). It operates under a pressure of 34.5 kPa (5 psi), with a vacuum breaker set to open at -3.5 kPa (-0.5 psi) to allow air entry. Crucially, a 100 mesh suction screen is positioned near the bottom of the reservoir. This screen is vital for supplying filtered oil to the hydraulic gear pump, preventing contaminants larger than 150 Microns from entering the pump's inlet. This strainer can be removed for routine cleaning.
Hydraulic Gear Pump and Priority Valve
A Sauer/Sundstrand gear pump is responsible for supplying oil to both the hydraulic and hydrostatic systems. The pump's flow first enters an integrated priority flow divider. This division ensures a priority flow of 18.0 litres/min (4.8 gpm) is directed to the charge port, feeding the closed-loop hydrostatic system. The remaining pump flow is then diverted to the equipment port, powering the hydraulic system for loader, bucket, auxiliary, and power beyond circuits. The hydraulic pump itself is mounted to and driven by the hydrostatic tandem pump, which is directly coupled to the engine and driven from the flywheel end.
Loader Control Valve
This is a three-spool valve that governs the operation of the loader, bucket, and auxiliary hydraulic circuits. It also incorporates the main relief valve, a critical safety component that prevents system over-pressurisation.
Cylinders
The machine utilises two main types of cylinders:
- Bucket Cylinders: These control the precise movement of the bucket. Cushioning is employed at the rod end of these cylinders to provide a smoother operation and reduce shock loads.
- Loader Lift Cylinders: These are responsible for raising and lowering the loader frame. Cushioning is incorporated at the base end of these cylinders for a more controlled lift and lower action.
Auxiliary Disconnects
Located on the left loader frame, these disconnects provide the necessary auxiliary hydraulic power for operating various attachments, significantly increasing the machine's versatility.
Filtration System
Effective filtration is key to protecting hydraulic components. The Case 85XT features:
- Return Filter: This filter provides 2-micron filtration for the return oil from the hydraulic system, ensuring that any contaminants generated during operation are removed before the oil re-enters the reservoir.
- Charge Filter: This filter cleans the charge oil before it enters the hydrostatic tandem pump assembly, also offering 2-micron filtration.
Oil Cooler
The oil cooler plays a vital role in dissipating heat generated by the hydraulic system. It cools both the hydraulic system return oil and any hydrostatic drains, helping to maintain optimal operating temperatures and prevent fluid degradation.
Self-Levelling Valve
This intelligent valve automatically maintains a level bucket position as the loader frame is raised, reducing the risk of spillage and improving operator efficiency.
Refill Capacities and Fluid Recommendations
Knowing the correct fluid capacities and types is essential for proper maintenance. Here's a breakdown for the Case 85XT:
| Component | Capacity (U.S. gal / Litres) | Recommended Fluid Type |
|---|---|---|
| Engine Oil | 2.75 (10.4) | SAE 15W-40, API Service Category CH-4 (Case AKCELA No. 1 Engine Oil recommended) |
| Engine Coolant | 4.4 (16.5) | Extended-Life Coolant/Antifreeze |
| Hydraulic Reservoir | 5.7 (21.7) | SAE 10W-30 |
| Hydraulic System (Total) | 16.5 (62.4) | SAE 10W-30 |
| Chain Case Oil | 8.0 qts (7.6 L) | SAE 10W-30 |
| Fuel Tank | 17.3 (65.5) | Diesel Fuel |
Important Note on Engine Oil: Case AKCELA No. 1 Engine Oil is specifically recommended for Case engines, ensuring proper lubrication under all operating conditions. This oil meets the API CH-4 service category. Always refer to the ambient temperature ranges when selecting the correct viscosity.
Essential Service Intervals
Adhering to a regular maintenance schedule is critical for preventing costly breakdowns and ensuring the longevity of your Case 85XT. Here are the recommended service intervals:
| Service Task | Interval |
|---|---|
| Lubricate Cylinder Pivot Points | Every 50 Hours |
| Check Hydraulic Fluid Level | Every 50 Hours |
| Check Chain Case Oil Level | Every 50 Hours |
| Check Battery Connections | Every 100 Hours |
| Check Alternator/Fan Belt Tension | Every 100 Hours |
| Check Drive Chain Tension | Every 250 Hours |
| Clean Primary Air Filter | Every 250 Hours |
| Change Engine Oil | Every 250 Hours |
| Replace Engine Oil Filter | Every 250 Hours |
| Replace Hydraulic Filter Element | Every 500 Hours |
| Replace Fuel Filter Element | Every 500 Hours |
| Replace Primary Air Filter | Every 500 Hours |
| Replace Secondary Air Filter | Every 500 Hours |
| Change Chain Case Oil | Every 1000 Hours |
| Change Hydraulic Fluid | Every 1000 Hours |
| Change Engine Coolant | Every 2000 Hours |
Key Replacement Parts
Having the correct part numbers on hand can save you time and ensure you're using the right components for your Case 85XT. Here are some common replacement part numbers:
| Part Description | Part Number(s) |
|---|---|
| Engine Oil Filter | J934429, 84496951 |
| Engine Fuel Filter | J931062, 86990957 |
| In-Line Fuel Filter | D139225 |
| Primary Engine Air Filter | 222425A1, 86982522 |
| Secondary Engine Air Filter | 222429A1, 86982523 |
| Hydraulic Oil Filter | N9025, 84239751 |
| Fan Drive Belt | J911559 |
Troubleshooting Common Issues
While the service manual is extensive, understanding common issues can be beneficial. For instance, if you notice a loss of hydraulic power, it could be due to low hydraulic fluid, a clogged filter, a faulty pump, or a leak in the system. Always start by checking the fluid level and the condition of the filters. If the engine is running rough, check the fuel system, air intake, and ensure the correct engine oil is being used.
Hydraulic Pressure Specifications
A critical specification for the Case 85XT's hydraulic system is its operating pressure. The hydraulic system pressure is rated at 3000 psi (207 bar). Maintaining this pressure is essential for the proper functioning of all hydraulic components, including the loader lift and bucket cylinders.
Frequently Asked Questions
Q1: What is the total hydraulic system capacity of the Case 85XT?
The total hydraulic system capacity is 16.5 U.S. gallons (62.4 litres).
Q2: What type of engine oil is recommended for the Case 85XT?
SAE 15W-40 API Service Category CH-4 engine oil is recommended. Case AKCELA No. 1 Engine Oil is the preferred choice.
Q3: How often should the hydraulic filter element be replaced?
The hydraulic filter element should be replaced every 500 hours of operation.
Q4: What is the purpose of the charge filter?
The charge filter filters the charge oil before it enters the hydrostatic tandem pump assembly, providing 2-micron filtration to protect this critical component.
Q5: Where is the hydraulic reservoir located?
The hydraulic reservoir is located in the left rear of the chassis.
By diligently following these maintenance guidelines and understanding the core components of your Case 85XT skid steer loader, you can ensure reliable performance, maximise its operational lifespan, and minimise the risk of unexpected downtime. Regular checks and adherence to the service intervals are your best defence against potential problems.
If you want to read more articles similar to Case 85XT Skid Steer: Your Ultimate Maintenance Guide, you can visit the Maintenance category.