Lawn Mower User Manual
Part No 350324    Form No F031108A 
3
PR & OS Owner’s Manual 
SERIAL PLATE DATA 
Record the model number, serial number, date of 
purchase, and where purchased. 
Purchase Date: 
Purchased From: 
Specifications
PR550 PR550H OS551  OS551H PR550T PR550HT PR600S OS600S 
Engine: HP  5.5 (4.1 kW)  5.5 (4.1 kW)  5.5 (4.1 kW)  5.5 (4.1 kW)  5.5 (4.1 kW)  5.5 (4.1 kW)  6.0 HP (4.7kW)  6.0 HP (4.7kW) 
Engine: Model  12H1320118B8 GX160T1QX2 12H1320118B8 GX160T1QX2 12H1320118B8 GX160T1QX2  EX17D50012  EX17D50012 
Engine: Type  B&S 
VANGUARD 
HONDA OHV  B&S 
VANGUARD 
HONDA OHV  B&S 
VANGUARD 
HONDA OHV  SUBARU  SUBARU 
Engine: Fuel Capacity  3.0 qt. (2.84 L)  3.88 qt. (3.6 L)  3.0 qt. (2.84 L)  3.88 qt. (3.6 L)  3.0 qt. (2.84 L)  3.88 qt. (3.6 L)  3.8 qt.(3.6 L)  3.8 qt.(3.6 L) 
Engine: Oil Capacity  0.66 qt. (0.62 L)  0.69 qt. (0.65 L)  0.66 qt. (0.62 L)  0.69 qt. (0.65 L)  0.66 qt. (0.62 L)  0.69 qt. (0.65 L)  0.63 qt.(0.60 L)  0.63 qt.(0.60 L) 
Total Unit Weight:  149# (67.7 kg)  147# (66.8 kg)  162# (73.6 kg)  160# (72.7 kg)  139# (63.2 kg)  137# (62.3 kg)  137# (62.3 kg)  137# (62.3 kg) 
Engine weight:  36# (16.3 kg)  34# (15.4 kg)  36# (16.3 kg)  34# (15.4 kg)  36# (16.3 kg)  34# (15.4 kg)  34# (15.4 kg)  34# (15.4 kg) 
Max. operating slope  15
o
 20
o
 15
o
 15
o
 20
o
 20
o
 20
o
 20
o
Sound test in accordance with 
2000/14/EC 
101 dB(a)  101 dB(a)  101 dB(a)  101 dB(a)  101 dB(a)  101 dB(a)  101 dB(a)  101 dB(a) 
Sound at operators ear  82 dB(a)  82 dB(a)  82 dB(a)  82 dB(a)  82 dB(a)  82 dB(a)  82 dB(a)  82 dB(a) 
Vibration at operator position  0.82g (8.04 m/s
2
) 0.82g (8.04 
m/s
2
) 
3.2g 3.2g 3.2g 3.2g 3.2g 3.2g 










