Gehl R135, Operator'S Manual

Page: 149 / 206

145 50940193/DP0415
Changing Hydraulic Oil
The hydraulic oil must be replaced if it becomes contaminated, after major repairs, and
after 1000 hours or one year of use.
1. Perform the “Mandatory Safety Shutdown
Procedure” on page 14.
2. Wait until the engine has cooled.
3. Open the engine compartment according
to “Engine Access” on page 132.
4. Slowly loosen hydraulic oil filler cap (H,
Figure 108).
5. Position a waste oil collection container
with a capacity of at least 60 L (16 gals.)
underneath the hydraulic oil reservoir.
Note: The hydraulic reservoir drain plug
is accessed from underneath the machine at the left rear corner.
6. Remove the hydraulic reservoir drain plug (O, Figure 110) and allow the oil to drain
completely.
Important: Always dispose of hydraulic oil according to environmental laws or take to a
recycling center for proper disposal. DO NOT pour onto the ground or down a drain.
7. Unscrew and remove the hydraulic oil filter (L, Figure 109).
8. Clean the surface of the filter housing where the element seal contacts the housing. Put
clean oil on the rubber gasket of the new filter (L, Figure 109).
9. Install and tighten the filter (L, Figure 109) 3/4 of a rotation past the point where the
gasket contacts the filter head.
10. Reinstall and tighten drain plug (O, Figure 110).
11. Remove hydraulic oil filler cap (H, Figure 108) and fill the hydraulic oil reservoir until
the oil level is correct (Y, Figure 107).
Important: See “Fluid Capacities/Lubricants” on page 183 for proper hydraulic oil
grade and type. Hydraulic oil capacity listed is approximate. Always verify proper oil
level. See to “Checking Engine Oil Level” on page 133.
12. Start the engine and operate the drive, lift and tilt controls.
13. Stop the engine and check for leaks at the filter and reservoir drain plug.
14. Check the fluid level and add fluid if needed.
Figure 110 – Hydraulic Oil
Drain Plug
O