216 and 226 Skid Steer Loaders Machine Systems Caterpillar

Show/hide table

Personal injury or death can result from improperly checking for a leak. Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.

Note: Clean all lines and all components with 4C-6796 Mineral Spirits. Install new filters after the system has been flushed. Dispose of the fluid properly.

Note: During the filling and the flushing procedure, the hydrostatic system must be at maximum output. The hydrostatic system is normally neutralized when the parking brake is applied. Disengage the parking brake for the following procedure.

Filling the Hydrostatic System

There are two procedures for filling the hydrostatic system on the machine. The recommended procedure should be used when all of the tools are available. The second procedure is the alternative procedure. The second procedure should be used if a 4C-9710 Hand Pump is not available.

Recommended Procedure

1. Open the engine access door.

Show/hide table



Illustration 1	g00825160

2. Install the 8T-0856 Pressure Gauge to the pressure tap on the oil filter base with a 6V-3014 Hose .

Show/hide table



Illustration 2	g00562083

3. Attach a coupler assembly on the hose from the 4C-9710 Hand Pump to fill port (1) on the oil filter. Pump hydraulic oil into port (1) until one of the following events occurs:
   • two minutes elapse.

   • the oil level is at the middle of the sight gauge.

   Note: This will pump hydraulic oil into the piston pumps.

   Note: Do not exceed 4000 kPa (580 psi) in order to fill the charge circuit. Seal failure could result.

4. Add hydraulic oil to the hydraulic tank until the oil level reaches the middle of the sight gauge.

Show/hide table



Illustration 3	g00708332

5. Open the engine access door and raise the radiator assembly. Disconnect hydraulic lines (2) and (3). Fill the hydraulic lines with hydraulic fluid.

6. Lower the radiator assembly and close the engine access door.

7. Raise the cab. Refer to the Operation and Maintenance Manual, "Cab Support Operation" for the proper procedure.

Show/hide table



Illustration 4	g00708345

8. Disconnect hydraulic line (4). Fill the hydraulic line with hydraulic fluid. Reconnect the hydraulic line.

Show/hide table



Illustration 5	g00825217

9. Loosen the hose clamp (5) and disconnect hose (6). Fill the hose with hydraulic fluid and reconnect the hose (6) .

Show/hide table



Illustration 6	g00709708

10. Install the 8T-0855 Pressure Gauge to charge pressure tap (7) with a 6V-3014 Hose .

11. Lower the cab.

12. Start the engine and run the engine at low idle.

13. Look at the pressure gauge. The pressure should read 2900 ± 100 kPa (420 ± 15 psi) within 15 seconds of start-up. If the pressure is low, stop the engine. Check the hydraulic oil level in the tank. Determine the cause for low charge oil pressure before restarting the engine.

    Note: If charge pressure is not reached within 15 seconds, damage to the hydrostatic system will occur. Do not allow the hydrostatic system to operate with incorrect charge system pressures.

Alternate Procedure

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

This procedure should be followed if a 4C-9710 Hand Pump is not available.

1. Release the hydraulic system pressure. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release" for the proper procedure.

2. Raise the cab. Refer to the Operation and Maintenance Manual, "Cab Support Operation" for the proper procedure.

Show/hide table



Illustration 7	g00709718

3. Disconnect two hydraulic hoses (8). Each hose is located on the left top of each piston pump.

4. Add hydraulic oil to each piston pump until the ports are full.

5. Connect the two hydraulic hoses (8) .

6. Slowly loosen the hydraulic filler cap and remove the filler cap. Fill the hydraulic tank until the oil level is at the halfway point in the sight gauge.

Show/hide table



Illustration 8	g00708332

7. Open the engine access door and raise the radiator assembly. Disconnect hydraulic lines (2) and (3). Fill the hydraulic lines with hydraulic fluid and reconnect the hydraulic lines (2) and (3) .

8. Lower the radiator assembly and close the engine access door.

Show/hide table



Illustration 9	g00708345

9. Disconnect hydraulic line (4). Fill the hydraulic line with hydraulic fluid and reconnect the hydraulic line.

Show/hide table



Illustration 10	g00825217

10. Loosen the hose clamp (5) and disconnect hose (6). Fill the hose with hydraulic fluid and reconnect the hose.

Show/hide table



Illustration 11	g00709708

11. Install the 8T-0855 Pressure Gauge to charge pressure tap (7) with a 6V-3014 Hose .

12. Lower the cab.

13. Start the engine and run the engine at low idle.

14. Look at the pressure gauge. The pressure should read 2900 ± 100 kPa (420 ± 15 psi) within 15 seconds of start-up. If the pressure is low, stop the engine. Check the hydraulic oil level in the tank. Determine the cause for low charge oil pressure before restarting the engine.

    Note: If charge pressure is not reached within 15 seconds, damage to the hydrostatic system will occur. Do not allow the hydrostatic system to operate with incorrect charge system pressures.

Flushing the Hydrostatic System

Show/hide table

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.

Flushing of the entire hydrostatic system should be performed after a failure of a component or replacement of a component.

Note: If the oil becomes contaminated, premature component failure could result. Contaminated oil can also contribute to overheating.

Use the following procedure to flush the oil in the system.

Flush the Drive Lines

1. Raise the cab. Refer to the Operation and Maintenance Manual, "Cab Support Operation" for the proper procedure.

Show/hide table



Illustration 12	g00698366

2. Disconnect electrical connection (4) for brake solenoid (5) .

3. Lower the cab.

4. Lower the armrest and fasten the seat belt.

5. Start the engine and allow the machine to run for five minutes before beginning the flushing procedure.

6. Run the engine speed at low idle.

7. Disengage the parking brake in order to activate the hydrostatic system and the hydraulic system.

Note: When steps 8 through 11 are performed, barely lug down the engine.

8. Move the pilot operated hydraulic control ( hydrostatic) to the FORWARD position. Hold the pilot operated hydraulic control ( hydrostatic) in the FORWARD position for five seconds.

9. Move the pilot operated hydraulic control ( hydrostatic) in the NEUTRAL position. Hold the speed and direction control (joystick) in the NEUTRAL position for five seconds.

10. Move the pilot operated hydraulic control ( hydrostatic) to the REVERSE position. Hold the pilot operated hydraulic control ( hydrostatic) in the REVERSE position for five seconds.

11. Adjust the engine speed to high idle. Run the machine at high idle for one minute.

12. Repeat steps 8 through 12.

13. Check the hydraulic oil contamination level. Refer to Testing and Adjusting, "Hydraulic Oil Contamination - Test" for the proper procedure.

14. If the levels are not low enough, a 102-2828 Oil Filter (Cleanup) can be installed. Flush the system up to four times. If the levels are not low enough after the fourth time, drain the hydraulic oil and change the hydraulic oil filter. Refer to Operation and Maintenance Manual, "Hydraulic System Oil - Change" and the Operation and Maintenance Manual, "Hydraulic System Oil Filter - Replace" for the proper procedures.

Show/hide table



Illustration 13	g00698366

15. When the hydrostatic system is within standards, turn the machine OFF. Reconnect electrical connection (4) for brake solenoid (5) .

16. Lower the cab and bolt down the cab. Refer to Operation and Maintenance Manual, "Cab Support Operation" for the proper procedure.