Hydrostatic Transmission Oil - DeWalt X536 Instruction Manual

English
PRODUCT CARE, cont'd
Using the Transmission Bypass Valves
If for any reason the mower will not drive or you wish to move the mower, the two
hydrostatic transmissions are equipped with a bypass valve that will allow you to
manually move the mower short distances.
WARNING: Do not tow the mower, even with the bypass valve open. Serious
transmission damage will result from doing so.
iMPORTAnT: The mower is equipped with two hydrostatic transmissions. Each
transmission is equipped with a bypass valve that MUST be opened before manually
moving the mower.
iMPORTAnT: Unless purging air from the hydrostatic transmission oil system, the
bypass valves MUST be closed before operating the mower.
1. Loosen the two star knobs (a) securing the leg pad (b) to the mower. See Figure 23.
2. Remove the leg pad from the mower.
3. Remove the rear panel from the mower. Refer to Removing/installing The Rear
Panel on page 8.
iMPORTAnT: DO NOT open the bypass valves more than a maximum of two turns.
4. Locate the hydrostatic transmissions and open the two bypass valves (e) a maximum
of two turns.
5. Using the two star knobs , reinstall the rear panel.
6. Reinstall the rear panel. Refer to Removing/installing The Rear Panel on
page 8.
7. Reverse STEPS 1-6 to close the two bypass valves.
(a)
(b)
(c)
(d)

Hydrostatic Transmission Oil

WARNING: If the mower has been recently run, the engine, muffler and
surrounding metal surfaces will be hot and can cause burns to the skin. Let
the engine cool for at least five minutes. Exercise caution to avoid burns.
nOTE: This procedure contains the following instructions for checking , changing and
adding hydrostatic transmission oil:
• Checking The Hydrostatic Transmission Oil Level
• Changing The Hydrostatic Transmission Oil
• Adding Hydrostatic Transmission Oil
• Purging Air From The Hydrostatic Transmission
18
(a)
(e)
Figure 23
Checking the Hydrostatic Transmission Oil Level
1. Locate the hydrostatic transmission oil reservoir (a) behind the engine under the
control panel.
2. Ensure the hydrostatic transmission oil reservoir level is just above the upper reservoir
mounting bolts (b) as shown in Figure 24.
nOTE: The hydrostatic transmission oil level must always stay above the hose fittings on
the rear of the tank, otherwise air may be introduced into the system.
3. If necessary, add hydrostatic transmission oil. Refer to Adding Hydrostatic
Transmission Oil in this procedure.
(a)
Changing The Hydrostatic Transmission Oil/Oil Filter
WARNING: If the mower has been recently run, the engine, muffler and
surrounding metal surfaces will be hot and can cause burns to the skin. Let
the engine cool for at least five minutes. Exercise caution to avoid burns.
nOTE: Use care when changing the hydrostatic transmission oil and oil filter. Do not
allow oil to drip onto the hydrostatic transmission oil pumps.
1. Place a suitable container on the left side of the mower deck as close as possible to
the oil filter.
2. Loosen the hose clamp (a) securing the transmission oil hose (b) to the transmission
oil filter assembly (c). See Figure 25.
3. Positioning a funnel under the transmission oil filter assembly so that the funnel will
empty into the container positioned in STEP 1.
4. Disconnect the transmission oil hose from the transmission oil filter assembly and
allow the hydrostatic transmission oil to drain into funnel.
5. If necessary, perform the following to replace the oil filter:
a. Remove the existing oil filter (d) from the transmission oil filter assembly (c).
b. Apply a light amount of oil to the filter gasket.
c. Install the new oil filter and tighten 3/4 to 1 turn after gasket contacts transmission
oil filter assembly base.
6. Reconnect the transmission oil hose to the transmission oil filter assembly and secure
hose using the hose clamp loosened in STEP 2.
7. Tighten the hose clamp (a) securing the transmission oil hose (b) to the transmission
oil filter assembly (c).
8. Add new hydrostatic transmission oil. Refer to Adding Hydrostatic Transmission Oil
in this procedure.
Hydrostatic Transmission
Oil Fill Level
(b)
Figure 24
(c)
(a)
(b)
(d)
Figure 25