7 MAINTENANCE
104
7.7 Hydraulic Oil Change
The hydraulic oil should be changed
every 1000 service hours. Before
beginning the procedure, make sure
the machine is in a clean working
environment. Take any necessary
measures to prevent dirt or debris from
entering the hydraulic system.
To change hydraulic oil and filter:
1. Shut the machine down according to the procedure in section 5.13.
2. Allow the machine to cool, then release any residual pressure in the
hydraulic system by following the procedure in section 4.10 of this manual.
3. Lower the access panel from beneath the center of the machine to access
the hydraulic oil drain. Remove the drain plug (item 1) as shown (fig. 7.7-1).
4. Drain the used oil into a suitable catch container.
5. Dispose of the oil according to mandates.
6. Reinstall the drain plug and tighten.
7. Open the hydraulic oil fill cap (item 4, fig. 7.7-3), then refill the hydraulic
system with hydraulic oil as specified in chapter 3.
Note: Observe the hydraulic oil level sight gauge (item 5) located on the hydraulic
reservoir to ensure that the level is correct (fig. 7.7-3). Once oil is visible, fill
slowly to avoid overfilling.
8. Once full, reinstall the cap and start the engine according to the proper
starting procedure and operate all hydraulic circuits to work any trapped air
out of the system. Then, check the oil level. If low, add oil as necessary until
full.
7.7-1 7.7-2
1
3
7.7-3
RT-75 / RT-75HD US O&M
0405-073 2020-07
5
Full
Low
4
2
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