Scag Power Equipment SWZV - Manual (Page 34)

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Section 7
B. Changing Hydraulic Oil
The hydraulic oil should be changed after every 500 hours
or annually, whichever occurs first. The oil should also
be changed if the color of the fluid has become black or
milky. A black color and/or a rancid odor usually
indicates possible overheating of the oil, and a milky color
usually indicates water in the hydraulic oil.
-NOTE-
The hydraulic oil should be changed if you
notice the presence of water or a rancid
odor to the hydraulic oil.
1. Park the mower on a level surface, stop the engine
and remove the ignition key.
2. Place a suitable container under the hydraulic oil
filter. Remove the fill cap from the reservoir.
Remove the drain plug from the fitting on the
reservoir base. (See Figure 7-2). Allow the fluid to
drain into the container and properly discard it.
3. Re-install the drain plug into the reservoir and be sure
it is tight.
-NOTE-
Before refilling the hydraulic oil reservoir the
hydraulic oil filter should be changed as outlined
in section C on the next page.
4. Fill the reservoir to full tab below the filler neck with
20W50 motor oil.
5. Replace the reservoir fill cap. Start the engine and
drive forward and backward for two minutes. Check
the oil level in the reservoir. If necessary, add oil to
the reservoir.
A. Checking Hydraulic Oil Level
The hydraulic oil level should be checked after the first 10
hours of operation. Thereafter, check the oil after every
200 hours of machine operation or monthly, whichever
occurs first.
-IMPORTANT-
If the oil level is consistently low, check for leaks
and correct immediately.
1. Wipe dirt and contaminants from around the reservoir
cap. Remove the cap from the hydraulic oil reservoir.
2. Visually check the level of hydraulic oil. Hydraulic oil
must be at the full tab below the filler neck. If the
fluid is low, add 20W50 motor oil. DO NOT overfill;
(overfilling the oil reservoir may cause oil seepage).
3. Clean the fill cap and install it onto the reservoir.
Figure 7-2 Hydraulic Oil Reservoir
7.3 HYDRAULIC SYSTEM
HYDRAULIC OIL
RESERVOIR
DRAIN PLUG