Cub Cadet Big Country 640 Operator's Manual page 15

Drive Chain Tension
WARNING: Do not rely on a lifting device
alone to support machine while servicing.
Always use jack stands or wooden blocks to
support vehicle while work is being performed
with machine raised.
NOTE: Drive chain is set taught at the factory, so it will
not reach normal stretch limits until vehicle has
experienced reasonable hours of operation (100 hrs).
• Stop vehicle on level surface, but do not apply
parking brake.
• Put transmission in neutral and differential in the
disengaged position.
• Turn the ignition key to the STOP position and
remove the key.
• Use a safe lifting device to raise all four rear wheels
off ground and place jack stands or wooden blocks
under vehicle.
• Raise and secure cargo box, if manual lift.
• Rotate wheels toward or away from each other and
check to see if there is any slack in the chain.
See Figure 17.
• If the chain adjusters are not keeping the chain
tight, a1/2 link will need to be removed.
• If chain is still loose after the 1/2 link is already
removed, the chain should be replaced using a 98
to 99 link chain. DO NOT USE a 97 link chain or
less.
• If chain is still loose after installing a new 98 pitch
chain, see your Cub Cadet dealer.
Figure 17
Checking Transaxle Oil
Hot hydraulic oil will expand and show
IMPORTANT:
incorrect oil level. Check oil level when oil is cold and
with engine is not running.
• Park vehicle on level surface and apply parking
brake.
• Raise and secure cargo box, if manual lift.
Dirt and debris in oil may cause damage to
IMPORTANT:
transaxle. Clean area around opening before removing
dipstick.
Chain Adjusters
Sag In Chain
15
• Remove dipstick located on the top of the transaxle
housing and wipe dipstick clean. See Figure 18.
• Check oil level by screwing dipstick fully into
transaxle case and then remove to check oil level.
• Add universal (Hydraulic) tractor transmission fluid
as needed until oil level reaches the full mark on
dipstick.
• Install and tighten dipstick.
• Lower cargo box.
Figure 18
Changing Transaxle Oil
WARNING: The fluid for your transmission
has been specially formulated to ensure the
safe and proper operation of your vehicle.
When changing the transmission fluid replace
it with Cub Cadet Drive System Fluid Plus
ONLY. Failure to use Cub Cadet Drive
System Fluid Plus may result in a failure of the
drive system which could result in property
damage or personal injury. Do not substitute.
If brakes start to chatter or are noisy when
IMPORTANT:
applied, change transaxle oil before waiting until the
service interval.
• Park vehicle on level surface and apply parking
brake.
• Raise and secure cargo box, if manual lift.
• Access drain plug through slot on underside of
machine and remove plug.
• Check O-ring on drain plug and replace if missing
or in poor condition.
• Install and tighten drain plug.
Dirt and debris in oil may cause damage to
IMPORTANT:
transaxle. Clean area around opening before removing
dipstick.
• Remove dipstick located on top of transaxle
housing and wipe dipstick clean.
• Add approximately 189 oz (5.5 liters) of Shell TTF-
SB Oil (Cub Cadet Part No. 737-3120 or 737-3121).
• Check oil level by screwing dipstick fully into
transaxle and then remove to check level.
• Wait for two minutes and then check oil level again.
• Install dipstick and lower cargo box.
Dipstick