Scag Power Equipment STR - Manual (Page 46)

40
Section 7
The fluid level in the cutter deck gearboxes (Figure 7-12)
should be checked after every 100 hours of operation or
bi-weekly, whichever occurs first.
1. Remove the foot plate from the cutter deck to gain
access to the cutter deck gearboxes.
2. Clean and remove the check plug dipstick from the
center gearbox (Figure 7-12). Visually check the fluid
level on the dipstick. The fluid level must be between
the full line and bottom of the dipstick. If the fluid
level is low, fill gearbox through the check plug port
with Mobil SHC630 lubricant. Install the check plug
dipstick and tighten securely.
3. Clean and remove the check plug from the left
gearbox (Figure 7-12). Check that the lubricant level
is up to the bottom edge of the check plug hole. If
lubricant is low, add Mobil SHC630 lubricant
through the hole in the top of the gearbox until it is
level with the bottom of the check plug hole. Install
the check plug and tighten securely.
4. Repeat step 3 on the right gearbox.
5. Install the foot plate to the cutter deck.
B. Changing Lubricant
The lubricant in the three cutter deck gearboxes should be
changed after every 500 hours of operation or yearly,
whichever occurs first.
1. Remove the foot plate to gain access to the cutter
deck gearboxes.
2. Raise the cutter deck and secure in place with the two
prop rods.
3. Beneath the cutter deck is an access hole to center
gearbox drain plug (Figure 7-13). Clean the area
thoroughly and then place a suitable container under
the drain plug.
4. Remove the drain plug and drain the lubricant into
the container and properly discard it.
5. Install the drain plug.
6. Using the Blade Buddy accessory, remove the left
cutter blade attaching bolt, lockwasher, flatwasher
and the spacer. Remove the cutter blade and blade
drive adapter from the spindle shaft.
7. The drain plug for the left gearbox is now accessible.
Place a suitable container under the gearbox drain.
8. Clean and remove the drain plug. Drain all lubricant
into the container and properly discard it. Install the
drain plug.
9. Repeat steps 6 through 8 to change the lubricant in
the right gearbox.
10. Install the cutter blade and blade drive adapter
assembly to the spindle shaft using the flatwasher,
lockwasher, spacer and bolt. Tighten the bolt to a
torque of 150 ft-lb.
-IMPORTANT-
The blades must be installed 90° to each
other as shown in Figure 7-13. If the blades
are not installed as shown, they will contact
each other and could cause severe damage
to the blades, deck, and blade drive system.
11. Lower the cutter deck.
Figure 7-13 Gearbox Drain
Blade Adapter
Center Gearbox
Drain Plug
Left Gearbox
DrainPlug
Location Right Gearbox
Dr
ainPlug
Location
Blade Adapter
Attaching Hardware
Bolt, Lockwasher and
Flatwasher. Attaching Hardware
Bolt, Lockwasher and
Flatwasher.