Ariens 51121600 User manual

Instruction Sheet
Kit Numbers: 51121600, 51121700, 51121800 & 51122300
Copyright 2015 • Ariens Company • Brillion, WI 54110 08401009 • 2/15 • Page 1 of 8
CRANK PULLEY KIT
Package Contents
Check the contents of your kit for the parts listed below.
Also see Figure 1.
DISASSEMBLY
Models 911174, 175, 178, 179, 181, 375, 379
1. Disconnect spark plug wire.
2. Move cable adjuster to loosen wheel drive cable.
3. Disconnect the drive cable spring from the
transmission bracket. See Figure 2.
WARNING: FAILURE TO FOLLOW
INSTRUCTIONS could result in personal injury
and/or damage to unit.
Read, understand, and follow all safety practices
in Owner/Operator Manual before beginning.
Item Description Qty Ariens P/N
1 Ground Drive Pulley
(51121600, 51121700) 1 07343800
2 Ground Drive Pulley
(51121800, 51122300) 1 07344500
3 Dome Plug (51121600,
51121700) 1 07500339
4 Belt Channel Plug (51121800,
51122300) 1 04853600
5 10-24 x 3/8" Tapping Screw
(51121800, 51122300) 2 07400033
6 1 x 1 3/8 x .179" Spacer
(51121700, 51122300) 1 05501224
7 3/16 x 3/16 x 5/8" Square Key 1 06600219
8 1 3/32" Wave Washer 1 09250700
9 3L Wrapped V-Belt 1 07200633
10 Belt Crank Guide 1 04866851
11 12-24 x 1/4" Hex Washer
Head Machine Screw 4 06100223
12 12-24 x1" Hex Washer Head
Tapping Screw 1 07400121
Figure 1
1, 2
3
11
4
5
6 7
8
9
10
12
Figure 2
1. Drive Cable Spring
2. Transmission Bracket
1
2

08401009 • 2/15 • Page 2 of 8
4. Remove blade and blade adapter from the
crankshaft.
5. Remove two tapping screws retaining drive pulley
guide. Remove guide, pulley and key.
IMPORTANT: Discard two tapping screws, drive pulley
guide, pulley and key.
6. Remove belt channel guides. Discard screws.
7. Pull belt over end of crankshaft to allow belt to slide
out through belt channel.
8. Rotate transmission backward to remove hardware,
then adjust to loosen belt.
9. Remove belt and pull through the belt channel. See
Figure 3.
Figure 3
9
1. Blade
2. Blade Adapter
3. Drive Pulley Guide
4. Belt Channel Guides
5. Engine Pulley with Key
6. Transmission
7. Transmission Bracket
8. Belt
9. Belt Channel
10. Transmission Pulley
11. Crankshaft
76810511
24
3
1

08401009 • 2/15 • Page 3 of 8
DISASSEMBLY
Models 911176, 177
1. Remove two bolts from blade and remove blade.
See Figure 4.
2. Remove center bolt and three washers. See
Figure 5.
3. Loosen adjustment nuts on BBC engagement
cable. Loosen front nut until threads are no longer
engaged and nut is loose on the cable. See
Figure 6.
4. Insert a 1/4" (6 mm) pry bar or similar tool into the
hole in the clutch actuating lever. Pry lever to the
right (clockwise) and disconnect cable spring from
clutch lever. Gradually release lever.
5. While holding anti-rotation arm in position with pry
bar, remove anti-rotation shoulder bolt. Gradually
release the spring tension and allow the
anti-rotation arm to rotate counter-clockwise.
6. Remove BBC spring.
7. Remove blade brake clutch and washers from
engine shaft.
8. Remove two tapping screws retaining drive pulley
guide. Remove guide, pulley, and key.
IMPORTANT: Discard two tapping screws, drive pulley
guide, pulley and key.
Figure 4
12
1.Blade Bolts
2.Blade
Figure 5
1
2
1.Center Bolt
2.Washers
Figure 6
654123
7
1. BBC Engagement Cable
2. Front Adjustment Nut
3. Clutch Actuating Lever
4. Cable Spring
5. Anti-rotation Arm
6. Anti-rotation Shoulder Bolt
7. BBC Spring
8. Blade Brake Clutch
8

08401009 • 2/15 • Page 4 of 8
9. Remove BBC baffle. See Figure 7.
10. Remove two tapping screws retaining inner belt
guides and remove guides. Discard screws. See
Figure 7.
11. Pull belt over end of crankshaft to allow belt to slide
out through belt channel.
12. Rotatetransmissionbackward to remove hardware,
then adjust to loosen belt.
13. Remove belt and pull through the belt channel. See
Figure 8.
Figure 7
1. Crankshaft Belt Guide
2. BBC Baffle
3. Inner Belt Guide
123
Figure 8
5
1. Engine Pulley with Key
2. Transmission
3. Transmission Bracket
4. Belt
5. Belt Channel
6. Transmission Pulley
7. Crankshaft
32
4617

08401009 • 2/15 • Page 5 of 8
RE-TAP BELT GUIDE HOLES
All Models
Use the included 12-24 x1" hex washer head tapping
screw to enlarge the belt guide attaching hole threads.
1. Insert tapping screw (item 12) into each of the four
attaching holes. See Figure 9.
2. Tighten fastener until it is approximately 1/4" into
each hole.
IMPORTANT: Do not exceed 1/4" depth.
3. Clean all grass and debris from belt channel.
INSTALL BELT CHANNEL PLUG
Models 911174, 175, 178, 179, 181, 375, 379
NOTICE: Install either sheetmetal plug (item 4) or plastic
dome plug (item 3), depending on mower/kit. Mowers
equipped with BBC (911176, 911177) do not require a
plug, as the cable routes through this hole.
Belt Channel Plug
1. Install metal plug (item 4) using two 10-24 x 3/8"
tapping screws (item 5). Hold plug in position from
inside of channel while securing screws. See
Figure 10.
Dome Plug
2. Insert dome plug (item 3) into hole in belt channel.
Plug snaps into position. See Figure 10.
REASSEMBLY
Models 911174, 175, 178, 179, 181, 375, 379
See Figure 11
1. Route belt (item 9) through belt channel.
2. Route belt around transmission pulley and reinstall
transmission bracket and hardware.
3. Rotate transmission back into location. Loop belt
over crankshaft end.
4. Models 911174, 178, 375, 379 only: Install spacer
(item 6) onto crankshaft.
IMPORTANT: Install new engine pulley (item 1) with thick
side of pulley toward engine. See Figure 11 for
orientation.
Figure 9
Re-tap four holes. Do not exceed 1/4" depth.
Figure 10
Item 4
Item 5
Belt Channel Plug
Dome Plug Item 3

08401009 • 2/15 • Page 6 of 8
5. Install square key (item 7) and wave washer
(item 8).
6. Install belt channel guides and belt crank guide
(item 10) using four 12-24 x 1/4" screws (item 11).
IMPORTANT: Do not use original screws. Do not over
tighten.
7. Replace blade adapter, blade, flat washer, lock
washer and bolt on shaft and torque to 37.5 – 50
lbf-ft (51 – 68 N-m).
NOTICE: Bolt must fully compress lock washer.
8. Connect the wheel drive cable spring to the
transmission bracket.
9. Adjust wheel drive cable (see Adjust Wheel Drive
Control on page 8).
10. Connect spark plug wire.
REASSEMBLY
Models 911176, 177
See Figure 12
1. Route belt (item 9) through belt channel.
2. Route belt around transmission pulley and reinstall
transmission bracket and hardware.
3. Rotate transmission back into position.
4. Loop belt over crankshaft end.
5. Model 911176 only: Install spacer (item 6) onto
crankshaft.
IMPORTANT: Install new engine pulley (item 2) with thick
side of pulley on top. See Figure 12 for orientation.
6. Install key (item 7) and wave washer (item 8).
7. Install belt channel guides and belt crank guide
(item 10) using four 12-24 x 1/4" screws (item 11).
IMPORTANT: Do not use original screws. Do not over
tighten.
8. Reinstall BBC baffle and tighten hardware.
9. Install washers and BBC assembly on engine shaft.
Ensure that key in BBC is aligned with keyway on
engine shaft. See Figure 12.
10. Reinstall BBC spring.
11. Using pry bar, rotate BBC assembly clockwise until
anti-rotation arm is aligned with shoulder bolt
bracket. Install bolt and fully tighten. See Figure 13.
12. Using a 1/4" (6 mm) pry bar or similar into the clutch
actuating lever. Pry lever to the right (clockwise).
Figure 11
Item 6
(911174, 178, 375, 379 Only)
Item 9
Item 1
Item 7
Item 11
Item 10
Item 8
Figure 12
Item 6
(911176 Only)
Item 9
Item 2
Item 7
Item 11
Item 8
Item 10 06400926 Washer
911176: Qty = 2
911177: Qty = 1

08401009 • 2/15 • Page 7 of 8
13. Reattach cable spring to clutch actuating lever. See
Figure 6.
14. Gradually release spring tension until pry bar is
loose and can be removed.
15. Install center bolt and washers. Torque bolt to 55
lbf-ft (75 N•m). See Figure 5.
16. Reinstall front lock nut on BBC engagement cable.
Pull on the cable to allow only a slight amount of
slack and hand tighten front adjustment nut against
the cable bracket. Tighten the rear adjustment nut.
See Figure 14.
17. Replace blade and two bolts on blade brake clutch.
Torque bolts to 38 lbf-ft (52 N•m).
18. Connect the wheel drive cable spring to the
transmission bracket.
19. Adjust wheel drive cable (see Adjust Wheel Drive
Control on page 8).
20. Connect spark plug wire.
Figure 13
Align anti-rotation arm with shoulder bolt bracket here.
Figure 14
1
2
3
1.Front Adjustment Nut
2.Cable Bracket
3.Rear Adjustment Nut
4.Cable
4

08401009 • 2/15 • Page 8 of 8
ADJUST WHEEL DRIVE CONTROL
All Models
1. See Figure 15.
2. The unit should stop immediately when the wheel
drive control lever is released and not creep
forward when the wheel drive control lever is
disengaged with the engine running.
3. The unit’s forward speed should increase as the
wheel drive control lever is moved closer to the
handlebar. If the unit does not accelerate smoothly
or seems to slip under load, adjust the wheel drive
control cable.
IMPORTANT: DO NOT adjust the cable so the
transmission does not return to neutral and stop the unit
when the wheel drive control is released.
To Adjust:
1. Stop engine and wait for all moving parts to
completely stop.
2. Clean any dirt or debris from the drive components.
3. Make sure the return spring is properly connected
to transmission bracket.
4. On the handlebar, loosen cable nuts away from
bracket. See Figure 29.
5. Move the wheel drive cable adjuster up or down the
handlebar. See Figure 29.
To increase speed, move the cable adjuster down
the handlebar.
To decrease speed, move the cable adjuster up
the handlebar.
6. Check the adjustment.
A. Start the engine.
B. Slowly squeeze the wheel drive control lever
against the handlebar. The unit should move
forward smoothly and increase in speed as
handle is moved closer to handlebar.
C. Release the wheel drive control lever. The unit
should stop immediately and not creep forward.
CHECK OPERATOR PRESENCE CONTROL /
BLADE BRAKE CLUTCH (OPC / BBC)
HANDLE
Models 911176, 911177
The blade must stop within 3 seconds after releasing
OPC / BBC handle. If the blade does not stop, adjust as
necessary or inspect and repair before using.
Figure 15
Razor Fig 29
1. Cable Adjuster
2. Cable Nuts
1
2