MTD 243-680 - Manual (Page 3)

4. After two or three full firm pulls on recoil (or as
soon as engine fires), move throttle control to run
position.
5. Operate a new engine at intermediate speeds and
light load for the first few hours as you would a
new automotive engine.
6. To stop engine, move throttle control lever on han­
dle to stop position.
7. If carburetor needs adjustment to start or for oper­
ation, see "carburetor readjustment" section.
8. For forward travel, move drive engagement lever
FORWARD as far as possible. To stop forward
movement, pull lever towards the operator into
neutral position.
NOTE: A brief break-in period is essential to
insure maximum engine life. This consists of
running the engine at half-speed for a period
of time required to use one tank of gasoline.
This is necessary on the initial run only. It is
also recommended that the oil be changed
after five (5) hours of operation. This allows
for the removal of impurities which may
have accumulated during the break-in peri­
od. Sub.sequent oil changes should be made
as stated in the engine manual. Always
check oil before using your vacuum. Be sure
crankcase is full.
ADJUSTMENTS
c. Move lever to which control wire is fastened at
engine, to full open position and retighten
screw to secure throttle control wire assembly.
LUBRICATION
Important: Always stop engine and disconnect spark
plug wire before cleaning, lubricating or doing any
kind of work on lawn mower.
1. ENGINE—Follow Engine Manual for lubrication
instructions.
2. CHAIN—Lubricate periodically with light engine
oil (S.A.E. No. 10 or 20)
3. CONTROLS—Lubricate periodically the control as­
semblies and conduit and wire with light engine
oil for ease of operation.
4. WHEELS—Lubricate periodically bearings on all
four wheels with light engine oil.
BELT REMOVAL (SELF PROPELLLED ONLY)
(Refer to Figure 1)
1. Remove the nozzle (Ref. No. 27) or hose adapter
plate (optional equipment) if on the unit, by re­
moving four flat washers (Ref. No. 28) and thumb
nuts (Ref. No. 29.).
CAUTION: Do not at any time make any adjustment to
power vacuum without first stopping engine and dis­
connecting spark plug wire.
1. NOZZLE GROUND CLEARANCE—Th is vacuum can
be adjusted for nine heights from 0" to 5". To
change the height, move the height adjustment
lever towards the engine and forward to raise the
height and move tO' the rear to lower the height.
The one lever adjusts the front two wheels at the
same time.
2. BELT—The belt requires no adjustment. The idler
maintains the proper tension on the belt at all
times.
3. THROTTLE—Self propelled unit only. If adjustment
becomes necessary, the throttle control wire as­
sembly can be reset as follows:
a. Loosen, but do not remove, screw securing
throttle control wire assembly at engine.
b. Move throttle control lever on handle to "Fast"
position.
2. Remove engine crankshaft bolt (Ref. No. 25) and
lockwasher (Ref. No. 24).
3. Remove four hex nuts (Ref. No. 17) and lockwash-
ers (Ref. No. 18) from rear of blower housing as­
sembly (Ref. No. 26). This will allow you to remove
the blower housing assembly and air vane assem­
bly in one unit.
4. Remove the hopper engine mounting plate by re­
moving five bolts (Ref. No's. 35 and 37) and wash­
ers (Ref. No. 37).
5. Unhook idler spring (Ref. No. 55) and remove.
6. Remove the bearing support bracket (Ref. No. 84)
by removing two hex nuts (Ref. No. 85) and wash­
ers (Ref. No. 8).
7. Remove and install the new belt.
8. Reverse the above procedure making sure the
small end of the four spacers are towards the en­
gine.