Groundsmaster 3500--D Hydraulic System (Rev. D)Page 4 -- 57
Change Hydraulic Fluid
Change hydraulic fluid after every 400 operating hours
or yearly, under normal conditions. If fluid becomes con-
taminated, the complete hydraulic system must be
flushed (see Flush Hydraulic System). Contaminated
fluid looks milky or black when compared to clean oil.
1. Position machine on a level surface, lower the cut-
ting units, stop the engine, engage the parking brake
and remove key from ignition switch.
2. Thoroughly clean area around the hydraulic suction
hose at gear pump (Fig. 37). Disconnect suction hose
and let hydraulic fluid flow into drain pan. Reinstall hose
when hydraulic fluid stops draining.
3. Fill hydraulic tank with approximately 6 gallons (22.6
liters) of hydraulic fluid. Refer to Check Hydraulic Fluid.
IMPORTANT: Use only hydraulic fluids specified.
Other fluids could cause system damage.
4. Install hydraulic tank cap. Start engine and use all hy-
draulic controls to distribute hydraulic fluid throughout
the system. Also, check for leaks, then stop the engine.
5. Check level of hydraulic fluid and add enough fluid to
raise level to FULL mark on dipstick. DO NOT OVER
FILL.
1. Gear pump 2. Suction hose from tank
Figure 37
1
2
1. Hydraulic tank 2. Cap
Figure 38
2
1
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