To purchase parts for the 420BU (40" Main Assembly RF039000):
- Reference the part needed from the parts diagram and refer to the parts list below.
- Copy the Part Number and paste it into the search window above to see availability and pricing.
- Confirm your parts selection and "Add To Cart".

Item | Part Number | Description | QTY | Item | Part Number | Description | QTY | |
1 | NB1621 | CAPLUG, KB, RED | 1 | 23 | NB5520 | BOLT, CARRIAGE, 3/8"-16 X 1 1/4" | 3 | |
2A | MP371800 | REGULATOR, STND MDL, ASM. | 1 | 24 | NB3450 | WASHER, FLAT, 3/8" | 7 | |
2B | MP509500 | REGULATOR, ASM, SAFESTOP | 1 | 25 | NB3267 | NUT, LOCK, 3/8", NC | 3 | |
3 | MP367600 | SLIDE, STRAP, 2", BLK | 1 | 26 | NB6044 | SCREW, CAP, .3/8 X 1 1/4 | 4 | |
4 | MP4515 | TUBING, OIL DRAIN | 1a· | 27 | MX1075 | WASHER, LOCK, .3/8" | 4 | |
5 | NB6530 | SCREW, CAP, HH, 1/4-20 X 1 | 2 | 28 | NB6111 | WASHER, LOCK, 5/16" | 3 | |
6 | NB065100 | BOLT, HEX, MB )( 25, GD a.a. ZINC | 1 | 29 | MP373800 | PAD, BATTERY, 5"L X 3.25"W X .12" THK | 1 | |
7 | NB064900 | SCREW, #10 x 1/2", TRUSS HD, PHIL. | 1 | 30 | MP6600 | VELCRO, FELT, BLACK | 15• | |
a | NB052000 | BOLT, HEX 5/16-18 X 2-1/2. SS | 1 | 31 | MP6600 | VELCRO, FELT, BLACK | 12· | |
9 | MP265200 | BUSHING, STEEL. l.D. .34 x .50 O.D. | 1 | 32 | NB7282 | CLAMP, HOSE, N0.38 | 2 | |
10 | NB049200 | SCREW, BH, 10-24 x 5/8", SS | 3 | 33 | MP265600 | TANG, CLUTCH | 1 | |
11 | NB9510 | NUT, SPINLOCK, 10-24 | 3 | 34 | NB009900 | GROMMET, 11/16" x 1" | 1 | |
12 | MP394500 | TRAY, BATTERY, TALL, WELD. | 1 | 35 | MP4805 | SPACER, CLUTCH BOTIOM | 1 | |
13 | NB6545 | SCREW, CAP, HH, 5/16"-18 X 1" | a | 36 | NB005800 | SCREW, HH, 7/16-20 x 1 1/2 | 1 | |
14 | NB9267 | WASHER, FLAT, 5/16. | 9 | 37 | MP265500 | CLUTCH, ASM., MODEL 5219-43A | 1 | |
15 | NB3265 | NUT, LOCK, 5/16"-18, NC | 7 | 38 | MP267300 | CLUTCH, ASM. | 1 | |
16 | NB8125 | CLAMP, 1/4", ID, RETAINER | 1 | 39 | MP074400 | LATCH, DRAW | 1 | |
17 | MP362200 | BATIERY, 12V, 210CCA, AGM | 1 | 40 | NB007400 | BOLT, PHILLIPS PAN HD, 1/8-32 X 1/2 | 2 | |
18 | MP368100 | STRAP, 2" x 23", OPEN ENDS | 3 | 41 | NB9710 | NUT, KEPS, 8-32, ZINC | 2 | |
19 | NB019100 | BOLT, HEX, 1/4-20 X 3/4, GD 5 | 2 | 42 | MP496200 | DECAL, ENGINE, PE | 1 | |
20 | NB3350 | WASHER, FLAT, 1/4" | 7 | 43 | MP105900 | CYLINDER, STEEL, PAINTED, SAFETY FILL | 1 | |
21 | NB3275 | NUT, LOCK, 1/4" | 2 | 44 | NB065800 | PLUG, HOLE, 5/16•, BLK | 1 | |
22 | NB6110 | WASHER, LOCK, 1/4" | 2 |