Gas Walk Behind Mower — service parts and specifications. Also written 917389990.
Read this before you order anything. These figures are transcribed automatically from manufacturer manuals and can be wrong. Nothing here is a fitment guarantee or professional advice.
Provided free, as is, with no warranty and no liability accepted — you use it at your own risk and on your own responsibility. Check every number against the plate on your own machine before you buy or fit a part.
Reference data — no warranty, no fitment guarantee, used at your own risk. Disclaimer
Transcribed from the manufacturer manual — not a fitment guarantee. Manufacturers supersede part numbers during a production run: check these against the plate on your own machine before ordering.
Spark plug — Replace annually or every 100 operating hours. Cross-reference equivalents from other brands usually fit.
Spark plug gap — Set with a feeler gauge before installing. A wrong gap causes hard starting and rough running.
Engine oil — Grade depends on operating temperature, not on the machine. Several grades listed below are all correct — pick by season.
Blade — Sharpen or replace at the start of each season. Always balance a sharpened blade before refitting.
| Item | Value | Context | Page |
|---|---|---|---|
| Spark plug | RJ19LM4 | … (BELOW 32°F) OILCAPACITY: 20 OUNCES SPARK PLUG (GAP: .045") CHAMPION RESISTOR TYPE RJ19LM4 BLADE BOLT TORQUE: 35-40 FT. LBS. The model and serial … | 10 |
| Spark plug gap | .045 | … 31LTYPE (API-SF-SJ): SAE 30 (ABOVE 32°F); SAE 5W-30 (BELOW 32°F) OILCAPACITY: 20 OUNCES SPARK PLUG (GAP: .045") CHAMPION RESISTOR TYPE RJ19LM4 … | 10 |
| Engine oil | SAE 30 | OF PURCHASE: ; ASOLINE CAPACITY/TYPE: 1.25 QUARTS (UNLEADED REGULAR) 31LTYPE (API-SF-SJ): SAE 30 (ABOVE 32°F); SAE 5W-30 (BELOW 32°F) OILCAPACITY: 20 … | 10 |
| Engine oil | SAE 5W-30 | E CAPACITY/TYPE: 1.25 QUARTS (UNLEADED REGULAR) 31LTYPE (API-SF-SJ): SAE 30 (ABOVE 32°F); SAE 5W-30 (BELOW 32°F) OILCAPACITY: 20 OUNCES SPARK PLUG … | 10 |
| Engine oil | 5W-30 | PACITY/TYPE: 1.25 QUARTS (UNLEADED REGULAR) 31LTYPE (API-SF-SJ): SAE 30 (ABOVE 32°F); SAE 5W-30 (BELOW 32°F) OILCAPACITY: 20 OUNCES SPARK PLUG (GAP … | 10 |
| Blade | 850972 | … Screw 3J8-24 x 1-5/8 (Grd. 8) 52 850263 Helical Lockwasher 5/8 53 951074 Washer 54 850972 Blade 20" 55 850977 Blade Adapter 57 166072 Grass Bag 58 … | 31 |