Snapper RP21500 User Manual

DRIVEN DISC SERVICE
If the mower does not pull properly, refer to FIG. 12,
and check for the following;
□ Grease on drive disc (C)-causing slippage.
□ Broken or disconnected DRIVE SPRING (D)
(also refer to FIG. 14).
□ Driven disc rubber ring (B-1) worn - not con¬
tacting drive disc (C) properly.
□ Driven disc (B) out of adjustment
□ Worn belts
DRIVEN DISC ADJUSTMENT
The driven disc should be properly adjusted for optimum
operation, minimum rubber ring wear, smooth shifting,
and to prevent the mower from jumping out of gear due
to misadjustment. If the clutch is properly adjusted, and
both belts are in good condition (or are new), check the
two adjustments and correct if necessary.
Check the "DISTANCE" from the CENTER of the driven
disc's rubber ring to the left EDGE of the drive disc.
1. Shift the GROUND SPEED CONTROL into the
highest setting, and STOP engine. The CENTER of
the rubber ring should be 1/8" to 1/4“ from the left
EDGE of drive disc as shown. To re-adjust, loosen
connector hex nut (A-l) then slide the driven disc
LEFT or RIGHT (on hex shaft) as required. Re¬
tighten connector hex nut.
Check the "TRACKING POINT". The rubber ring should
contact the drive disc's surface at a point 1/8" in front of
an imaginary reference centerline crossing through the
center of the drive disc. You may wish to draw the
centerline with a pencil.
When properly adjusted, the rubber ring will "Track"
(run) in place approximately half way between the
center of the drive disc and it's jgft EDGE, with the
transfer rod (F) disconnected and the engine running.
Perform this test before making adjustment number 2.
DRIVEN DISC REPLACEMENT: If the driven disc rub¬
ber ring (B-1) is found to be badly chunked or worn
down to within 1/16" of the metal rim of the driven
disc hub (B), it must be replaced. Remove the clip (E)
at end of speed control rod, and then turn the
transfer rod (F) to a upright (vertical) position and
detach from the connector (A) (FIG. 14 & 15). Unhook
drive spring (D) (use needle nose pliers) and slide the
driven disc assembly off hex-shaft.
Remove the five machine screws (G) and plate secur¬
ing the driven disc rubber ring (B-1) to the hub
(B) and repiace the ring as shown in FIG. 15. Reverse
procedures for re-assembly and installation.
2. Re-adjust "Tracking", by imagining (or drawing) a
reference line across drive disc center; loosen hex
nut (W) securing thrust plate guide (X) to thrust plate
(Y) at slot (Z).
Move driven disc (with thrust plate Y) FORWARD or
REARWARD until the rubber ring contacts the drive
disc surface 1/8" in front of the imaginary reference
centerline. Re-tignten hex nut (W). Perform the test
again before reattaching transfer rod (F).

Snapper RP21500 Specifications

General

Brand	Snapper
Model	RP21500
Category	Lawn Mower
Language	English