Hydraulic System - Scag Power Equipment STT Operator's Manual

Section 7

7.3 HYDRAULIC SYSTEM

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 least 3" inches from top of the filler
neck. If the level cannot be determined visually, use
a clean tape measure to check the level. 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.
B. Changing Hydraulic Oil
Hydraulic Oil
Reservoir
Figure 7-2 Hydraulic Oil Reservoir
STT99HOR-1
29
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 and stop the
engine.
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 oil filter
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 fitting on the oil filter
base 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 3" inches from the top of 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.