21
Section 5: Maintenance
WARNING
Before inspecting, cleaning or servicing the unit, shut off engine, wait for all parts to come
to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove ignition
key on electric start models. Failure to follow these instructions can result in serious personal injury or
property damage.
BLADE BRAKE REPLACEMENT
Follow this procedure to install a new
blade brake.
To Remove Blade Brake:
1.
Stop engine, wait for all parts to
stop moving, and disconnect spark
plug wire.
2.
Remove belt cover as described in
“Belt Cover Removal” instructions.
3.
Remove hardware (G, Figure 5-8)
securing blade brake (H).
4.
Remove old brake (H) from idler
arm (I).
To Install Brake:
1.
Position new brake (H) in place on
idler arm (I).
2.
Center brake in sheave groove and se-
cure brake (H) with hardware (G) re-
moved earlier.
3.
Reinstall belt cover securely.
4.
Test operation of blade brake (see
“Blade Brake Control Test” in Operation
section).
BLADE DRIVE BELT
ADJUSTMENT
If the blade drive belt is slipping due to
lack of belt tension, follow the steps
below.
1.
Stop engine, wait for all parts to
stop moving, and disconnect spark
plug wire.
2.
Remove belt cover as described in
“Belt Cover Removal” instructions.
3.
With mower on level ground, adjust
blade cutting height at about 3" (measure
from ground to flat portion of blade).
4
. With the Blade Drive Control (Figure
5-7) in the disengaged position, set a
gap of 1/8" between the spring (F, Figure
5-9) and flat washer (E) by adjusting the
nut (D).
5.
Reinstall the belt cover securely.
6.
Test the operation of the blade brake
(see “Blade Brake Control Test” in the
Operation section).
7.
If the drive belt slips during opera-
tion, it may be necessary to relocate idler
(J, Figure 5-9) in the slot provided in the
mounting bracket.
With the engine
stopped and the spark plug wire dis-
connected,
loosen the hardware on the
idler (J) and slide it forward to take up
slack in the belt.
8.
Engage the blade drive and measure
the distance (X, Figure 5-8) between the
centers of pulleys (K) and (L). The dis-
tance should be 5-1/2 to 5-5/8". After
obtaining the correct dimension, reinstall
the belt cover securely and test the oper-
ation of the blade brake.
BLADE DRIVE CONTROL LEVER
ADJUSTMENT
Make the following adjustment if the
Blade Drive Control Lever releases dur-
ing operation.
1.
Stop engine, wait for all parts to
stop moving, and disconnect spark
plug wire.
2.
Engage the Operator Presence Control
and the Blade Drive Control. Without re-
leasing the controls, look inside the
cutout at the rear of the frame and make
sure the Operator Presence Control
latches (A and B, Fig. 5-10) are fully
engaged at point (C). If they are not fully
engaged, improper operation or prema-
ture wear could result. To adjust, loosen
hex nut (D) and shorten length of control
rod (E). To avoid over-adjusting, turn
rod only 1 to 2 turns per adjustment.
3.
Tighten hex nut securely after adjust-
ing control rod.
4.
Test by releasing the Operator
Presence Control. If properly adjusted,
the Blade Drive Control will disengage
when the Operator Presence Control is
released. Re-adjust as necessary by
repeating Steps 2 and 3.
Figure 5-9: Blade drive adjustment.
1/8"
J
D
E
F
Adjust idler in direction
of arrow to tighten blade
drive belt
Figure 5-10: Blade Drive Control Lever
adjustment.
B
E
D
A
C
Summary of Contents for 933E
Page 31: ...NOTES ...
