Troy-Bilt 21AE682W766 Operator's Manual page 17

4. Use a 3⁄8" wrench to remove the oil level check
plug on the left side of the transmission
housing. See Figure 5-6.
Oil Level Check Plug
Figure 5-6
5. If the oil level is correct, oil will seep out of the
check hole (allow extra time in cold weather). If
it does, the level is fine and you should replace
the check plug. If no oil seeps out add oil as
demonstrated in the Adding Oil Section on the
next page.
Tine Attachment Oil Level
NOTE: Two different gear oil checking procedures
for the tine attachment transmission are described
next. Use the first procedure if the dipstick in your
tine attachment has only a 'Check Cold' marking.
Use the second procedure if the dipstick has both
cold and hot markings at the end. First remove the
dipstick from the tine attachment transmission to see
which type of dipstick you have. See Figure 5-7. Then
replace the dipstick with the markings on the dipstick
facing to the rear.
Gear Oil Dipstick
Figure 5-7
For dipsticks With 'Check Cold' Marking (Cold
means 2 hours have passed since the tiller was used.)
1. Move the tiller to level ground.
2. Pull the Depth Regulator Lever back, then
push it down all the way (to engage its top
notch).
3. Place a sturdy support under the engine to
prevent the tiller from tilting too far.
4. Now slide three pieces of 2" x 4" lumber
underneath the drag bar — raising the drag
bar about 4-1⁄2" above ground. This elevation
allows an accurate "cold" gear oil reading .
5. Wait two hours with tiller elevated (allow more
time if temperature is below 40ºF).
6. Loosen and remove the transmission dipstick
on the back of the tine shield. See Figure 5-7.
Wipe it clean with a rag.
7. Hold the dipstick so its markings face to the
rear of tiller. Lower it straight down into the
sump hole to touch the drive shaft inside. See
Figure 5-7. Don't force or try to thread it back
in; an incorrect reading will result.
8. Remove the dipstick and check the oil level. It
should be anywhere within the crosshatched
area or even slightly above the Max marking.
If correct, replace the dipstick and remove the
boards used as props.
9. If the oil level was low, gear oil must be added
before using the tiller. See Adding or Changing
Gear Oil.
For Dipsticks With Hot/Cold Markings
1. Move the tiller to level ground.
2. Pull the Depth Regulator Lever back, then
push it down all the way (to engage its top
notch).
3. Place a sturdy support under the engine to
prevent the tiller from tilting too far.
4. Cold reading (preferred method): (Two hours
has passed since the tiller was used.) Place
a 2" x 4" board (on edge) under the drag
bar — raising the tiller and drag bar about
3-1⁄2" above ground. Hot reading: (Tiller was
operated for more than 30 minutes within
the past hour.) Do not use the wood prop to
elevate the tiller.
5. Follow Steps 4, 5 and 6 given for the other
dipstick type.
6. Remove the dipstick and check the level. It
should be within or above the "Cold" range
marking if taking a cold reading. If taking a hot
reading, the level should be within or slightly
above the "Hot" range.
7. If the level is incorrect, see Adding or
Changing Gear Oil.
Adding or Changing Gear Oil
For partial fill-ups (just a few ounces or less), use
SAE 140, SAE 85W-140, or SAE 80W-90 weight
gear oil with an API rating of GL-4 or GL-5. For full
replacement, use SAE 140 or SAE 85W-140 gear oil
with an API rating of GL-4 only. (At the factory, SAE
85W-140 weight gear oil is used.)
NOTE: Do not use automatic transmission fluid or
engine oil. They are too light in weight and will result
Back of
Tine Shield in transmission damage.
NOTE: The gear oil does not need to be changed. Do
so only if you know, or suspect, it is contaminated
with dirt, sand or other foreign particles.
Gear oil is available at authorized dealers and most
service stations, power equipment centers, or farm/
heavy equipment outlets.
Capacities: The Power Unit transmission holds
approximately 60 ounces and the Tine Attachment
transmission holds approximately 12-1⁄2" ounces.
Adding Gear Oil to the PTO Power Unit
Transmission
1. Do steps 1 and 2 of Checking the Power Unit
Oil Level.
2. Using a 3⁄4" wrench (or socket), remove the
bolt securing the handlebar base to the top
of the transmission (prop the handlebars
first to prevent them from falling). Then,
unplug the Forward Interlock wire harness
receptacle at the bottom of the handlebars.
Set the handlebar base and bolt aside on a
clean surface. The bolt hole in the top of the
transmission is the gear oil fill hole. See Figure
5-7.
3. Slowly pour gear oil through a clean funnel
into the transmission. Stop when gear oil
begins to flow from the oil level check hole on
the left side of the transmission. See Figure 5-7.
4. Reinstall the oil level check plug. Tighten it
securely.
5. Reinstall the handlebars using the mounting
bolt previously removed. Align the handlebars
so they point straight backwards, not at
an angle. Then tighten the mounting bolt
securely.
6. Reconnect the Forward Interlock wire harness
to the receptacle. Be certain it's secure.
7. Test the operation of the Forward Interlock
Safety System. See Forward Interlock System
on the next page.
Draining and Filling the PTO Power Unit
Transmission
1. Place a shallow pan under the transmission
gear oil drain plug. See Figure 5-8.
Gear Oil
Fill Hole
Oil Level
Check Plug
Figure 5-8
2. Remove the oil level check plug with a 3⁄8"
wrench. This vents the transmission for faster
oil draining.
3. Using the 3⁄8" wrench, remove the drain plug.
The gear oil will drain quite slowly since it is
thick. After about two quarts have drained, tilt
the tiller forward so any oil at the rear of the
transmission will drain out.
4. Clean the drain plug threads, put non-
hardening gasket sealant on the threads, and
reinstall the plug.
5. Refill the transmission with the correct amount
of gear oil before operating the tiller again.
When oil seeps from the oil level check hole,
the right amount of gear oil has been added.
Replace all plugs.
S
ection
Gear Oil
Drain
5 — S 17
ervice