Gravely 950001, Maintenance Manual

Page: 39 / 66

6 - 39
Disassembly And Inspection
Roller Chain
1. Remove the three hex. head bolts and two torque
prevailing nuts that secure the chain guard. Then
remove the chain guard (see below).
2. Check chain for slackness by lifting the chain
tensioner up by hand. If the top plastic slider of the
chain tensioner comes within 12 mm (1/2”) of the
main frame above it, the chain is too slack (see
below).
3. If the chain is found to be slack, first try reversing
tensioner blocks as they are machined on both
sides for extra life. If this is insufficient to take up
extra slack, remove chain half links as required
(see Step 4).
4. Remove the split pins from the “Half Links” then
remove one or both half links from the chain as
required (see below).
NOTE: While the chain is off the sprocket, check the
chain for damage such as broken rollers or signs of
galling. Replace with new chains if wear or damage is
excessive.
NOTE: Also, while the chain is off the sprocket check
the sprockets for wear (see below).
5. Wash the chain in a petroleum based solvent, blow
dry, then soak in oil.
Roller Chain Installation
Installation of the roller chain and the chain tensioner is
simply a reversal of the previous procedure.
Rear Hub Disassembly
1. Remove the hub grease retaining cap, take out the
split pin and remove the castellated nut from the
end of the axle.
2. Withdraw the hub assembly from the axle and
remove the inner cone and roller assembly of the
outer hub bearing.
12 mm (1/2”)
Lift Tensioner up by Hand
Note how the split pins on the right hand
side are arranged to oppose the pins on the
left hand side, this is important in preventing
the pins from being “snagged” during chain
movements causing possible pin removal.
Normal Sprocket
Worn Sprocket
Normal Sprocket Worn Sprocket