Briggs Stratton Lawn Mower 1687079 User Manual

54” Roller Bar Mower Kit  
Part No. 1687079  
Installation  
For Prestige / 1800 / 2800 / GT / Conquest / 1700 / 2700 / YT  
Instructions  
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Kit Contents: 1687079, 54” Roller Bar  
Ref Part No. Qty. Description  
8
9
2860626 14 WASHERS  
1720159  
2
2
2
8
1
ROLLERS, 2-3/4 x 2  
ROLLERS, 2-3/4 x 4-1/16  
COTTER, Pins  
ROLLER W/BUSHINGS  
BAR  
1
2
3
4
5
6
7
1723008A 1  
SHAFT & BAR ASSEMBLY  
NUT, Hex Adjusting  
LOCKNUTS, Top Lock, 3/8-16  
SLIDE  
WASHER, 1/2  
BOLT, Shoulder, 3/8-16  
SPACERS  
10 1678043  
11 1918459  
12 1678042  
13 1723009  
14 1733523A 1  
15 1931352  
16 1720142A 1  
1704082  
2860681  
1677507  
1924361  
2172622  
1701873  
1
2
1
1
1
6
ROCKER ARM, 54 Mower  
1
CARRIAGE BOLT, 3/8-16 x 1-1/2  
TRUNNION SUPPORT  
This kit is is to convert a frame hung mower to a  
roller bar mower.  
WARNING  
Before beginning any service work turn off the  
PTO, set the parking brake, turn off the ignition,  
and disconnect the spark plug wire(s).  
1
 
Roller Bar Mower Kit  
Installation Instructions  
O
C
E
P
U
I
D
F
Z
S
Q
A
W
B
I
T
A
X
N
R
U
J
A
V
G
K
H
M
L
Y
Q
Figure 3. Install 54” Roller Bar  
A. Capscrews, 5/16-18 x 3/4  
(Existing)  
B. Trunnion Support (New)  
C. Crank & Trunnion Assembly  
(Existing)  
I. Nuts, 5/16-18 &  
S. Chains, 4 Link (Existing)  
T. Capscrews,  
5/16-18 x 1-1/2 (Existing)  
U. Locknuts, & Washers (Existing)  
V. Slide (New)  
Lockwashers (Existing)  
J. Hair Pins (Existing)  
K. Clevis Pins (Existing)  
L. Adjustment Rods (Existing)  
M. Rocker Arm Assembly (New)  
N. Straps (Existing)  
W. Washer, 1/2 (New)  
X. Shoulder Bolt,  
D. Capscrews,  
5/16-18 x 1-1/4 (Existing)  
E. Height of Cut Plate (Existing)  
F. Arm (Existing)  
G. Washer, 5/16 (Existing)  
H. Upstop (Existing)  
O. Locknuts, 1/2-13 (Existing)  
P. Roller Bar Assembly (New)  
Q. Locknut, 3/8-16 (New)  
R. Carriage Bolt,  
3/8-16 x 1-11/32 (New)  
Y. Mower Deck (Existing)  
Z. Eccentric Nut (New)  
3/8-16 x 1-1/2 (New)  
INSTALL 54” ROLLER BAR  
3. Place upper trunnion on crank & trunnion assembly  
(C) through hole in rocker arm assembly (M) and  
roller bar assembly (P) as shown. Secure with 1/2-13  
locknut (O).  
1. Attach the rocker arm assembly (M, Figure 3) to the  
mower deck (Y) with the straps (N) and capscrews  
(A). Apply a thin film of grease to the inside of the  
straps.  
4. Place lower trunnion on crank & trunnion assembly  
(C) through hole in mower deck (Y) roller bar assem-  
bly (P) as shown. Secure with 1/2-13 locknut (O).  
2. Attach the chains (S) to the rocker arm assembly (M)  
using 5/16-18 x 1-1/2 capscrews (T), 5/16-18 lock-  
nuts & washers O) as shown.  
5. Connect the LH side roller bar assembly (P) to LH  
side of rocker arm assembly (M) securing with 3/8-16  
x 1-1/2 carriage bolt (R), eccentric nut (Z) and 3/8-16  
locknut (Q).  
Note: The four-link lift chain is bolted to the mower deck  
using the third link. This is correct for most mowing  
applications. If mowing ditches or other surfaces that  
require the mower to travel below its normal range, use  
the fourth link.  
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Installation Instructions  
Roller Bar Mower Kit  
6. Connect the LH side roller bar assembly (P) to LH  
side of mower deck (Y) securing with 3/8-16 x 1-  
11/32 shoulder bolt (X), 1/2 washer (W), slide (V),  
and 3/8-16 locknut (Q).  
7. Attach height of cut plate (E) and arm (F) to rocker  
arm assembly (M). Secure with 5/16-18 x 1-1/4 cap-  
screws (D) and 5/16-18 nuts & washers (I).  
8. Attach the trunnion support (B) to mower deck (Z).  
Secure with 5/16-18 x 3/4 capscrews (A).  
9. Attach the upstops (H) to mower deck (Z). Secure  
with 5/16-18 x 3/4 capscrews (A) and washers (G).  
10. Attach adjustment rod (L) to rocker arm assembly (M)  
using clevis pin (K) and hair pin (J).  
Refer to the Mower Deck Removal & Installation section  
in these instructions to install and level mower deck.  
Retain these instructions as a supplement to the original  
Operator’s Manual.  
MOWER DECK REMOVAL &  
INSTALLATION  
Chain Lift Models  
Figure 4. Pivoting Gauge Wheels - Select Models  
A
C
WARNING  
Engage parking brake, disengage PTO, stop  
engine and remove key before attempting to  
install or remove the mower.  
B
Muffler and surrounding areas may be hot.  
Removing the Mower Deck  
1. Park the tractor, fully lower the attachment lift, turn off  
the PTO, turn off the engine, remove the key, and  
engage the parking brake. If equipped, pivot the  
gauge wheels into sliding position (see Figure 4).  
D
Figure 5. Mower Lift  
A. Lift Hook  
B. Lift Chain  
C. PTO Belt  
D. Idler Arm  
2. Place mower in the lowest cutting position using the  
mower height control.  
3. Use the idler arm (D, Figure 5) to release tension on  
the PTO belt, and remove belt from the PTO pulley.  
5. Turn the wheels straight ahead. Pull back on spring-  
loaded lever (B, Figure 6) and lift mower hitch off of  
the tractor brackets (A).  
4. Pull down on the lift hooks (A, Figure 5) and unhook  
the lift chains (B).  
6. Turn wheels fully left, and slide mower deck out from  
under the right side of the tractor.  
CAUTION  
The muffler and surrounding areas may be hot.  
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Roller Bar Mower Kit  
Installation Instructions  
Installing the Mower Deck  
NOTE: Perform mower installation on a hard, level sur-  
face such as a concrete floor.  
A
1. Park the tractor, fully lower the attachment lift, turn off  
the PTO switch, turn off the engine, remove the key,  
and engage the parking brake. Turn the wheels fully  
to the left.  
2. Place mower in the lowest cutting position using the  
mower height adjuster. Slide the mower deck under  
the right side of tractor so that the mower hitch is  
aligned with front tractor hitch (A, Figure 6).  
B
3. See Figure 6. Turn wheels straight. Pull back on the  
spring-loaded lever (B) while lifting up on the mower  
hitch. Install the mower hitch onto tractor hitch brack-  
ets (A). When properly installed, the spring-loaded  
lever should seat fully underneath the brackets (A).  
Figure 6. Mower Hitch  
A. Tractor Hitch Brackets  
B. Spring-Loaded Lever  
4. See Figure 5. Connect the mower lift chains (B) to  
the the tractor lift hooks (A).  
NOTE 50” & 54” Mowers: The four-link lift chain is bolted  
to the mower deck using the third link. This is correct for  
most mowing applications. If mowing ditches or other  
surfaces that require the mower to travel below its nor-  
mal range, use the fourth link.  
5. See Figure 5. From left side of tractor, use the idler  
arm (D) to relieve belt tension. Install belt (C) onto the  
PTO pulley.  
6. If equipped, raise the attachment lift and rotate the  
front gauge wheels (Figure 4) into cutting position.  
5
 
Installation Instructions  
Roller Bar Mower Kit  
Leveling The Mower  
If the cut is uneven, the mower may need leveling.  
Unequal or improper tire pressure may also cause an  
uneven cut. Make sure tire pressure is correct as speci-  
fied in Checking Tire Pressure.  
A
B
SIDE-TO-SIDE LEVELING  
1. With the mower installed, place the tractor on a  
smooth, level surface such as a concrete floor. Turn  
the front wheels straight forward.  
2. Check for bent blades and replace if necessary.  
3. Place the mower in mid-cut position. Arrange the out-  
side mower blades so that they are pointing from  
side-to-side.  
Figure 7. Leveling The Mower Side-to-Side Eccentric  
Nut Models  
A. Outside Nut  
B. Eccentric Nut  
4. Measure the distance between the outside tips of  
each blade and the ground. If there is more than 1/8”  
(3mm) difference between the measurements on  
each side, proceed to step 5. If the difference is 1/8”  
(3mm) or less, proceed to step 6.  
5. See Figure 7. Loosen the outside nut (A). Turn the  
eccentric nut (B) to raise or lower left-hand side of  
mower. When mower is level, hold the eccentric nut  
while tightening the outside nut.  
A
B
NOTE: 44”, 50”, & 54” Mowers. When using a turbo col-  
lection system, raise the discharge side of the mower  
approximately 1/4” (6mm) to compensate for turbo  
assembly weight. Check the level of the cut grass  
and adjust the 1/4” (6mm) measurement as neces-  
sary for a smooth, even cut.  
Figure 8. Front to Back Leveling  
A. Rear Nut B. Front Nut  
FRONT-TO-BACK LEVELING  
NOTE: 54” mowers have two adjustment rods that  
should be adjusted simultaneously.  
6. Arrange the blades so they face front-to-back.  
7. Measure the distance from the ground to the front tip  
of the center blade, and from the ground to rear tips  
of left-hand and right-hand blades.  
Front tip of the center blade should be 1/4" (6mm)  
higher than rear tips of left-hand and right-hand  
blades. If not, proceed with steps 8 - 9.  
8. To raise front of mower deck, loosen front nut (B) and  
turn rear nut (A, Figure 8) against bracket. To lower  
front of mower deck, loosen rear nut (A) and the  
bracket will move backwards to lengthen rod.  
9 .Re-check the blade measurement then tighten the  
front nut (B) against the bracket to secure.  
Form No. 1729601  
Revision:01  
TP 200-4191-01-SK-SMAN  
MANUFACTURING, INC.  
Briggs & Stratton Yard Power Products Group  
Copyright © 2007 Briggs & Stratton Corporation  
Milwaukee, WI USA. All Rights Reserved  
500 N Spring Street / PO Box 997  
Port Washington, WI 53074-0997 USA  
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