RYOBI
25cc String Trimmers
Manufacturing Numbers
090333032, 090333033 and 090333034
Item Numbers
RY251PH, RY252CS and RY253SS
Repair Sheet
Techtronic Industries Power Equipment
P.O. Box 1288, Anderson, SC 29622
Phone 1-800-860-4050 www.ryobitools.com
FIGURE A
ITEM NO. RY251PH
RYOBI 25cc STRING TRIMMERS – ITEM NUMBERS RY251PH, RY252CS and RY253SS
11
8
9
10
7
4
3
5
6
14
13
12
15
2
16
5
17
18
1
20
19
2
RYOBI 25cc STRING TRIMMERS – ITEM NUMBERS RY251PH, RY252CS and RY253SS
PARTS LIST (FIGURE A)
KEY PART
NO. NUMBER DESCRIPTION QTY
5
6
7
8
9
1
2
3
4
312630001 Boom Clamp Assembly ..............................................1
940657164 Warning Icon Label .....................................................1
308470060 Upper Boom Assembly (Inc. Key Nos. 1-2) ................1
660563002 Screw (M4 x 20 mm, T20 Torx Hd. S.T.) .....................4
310831005 Control Handle Assembly (Inc. Key No. 4) .................1
518695009 Trigger Lock ................................................................1
690140011 Compression Spring ...................................................1
570234010 Rear Handle Grip ........................................................1
T660697001 Screw (M6 x 30 mm, T27 Torx Button Hd.) ................1
10
11
12
13
14
660925011 Screw (M4 x 8 mm, T20 Torx Pan Hd. S.T.) ................1
205044002 Powerhead Assembly w/Labels .................................1
678029002 Hex Nut (M6 x 1) .........................................................1
307318001 Throttle Cable and Wire Assembly .............................1
760961002 On/Stop Switch ..........................................................1
15 518696020 Trigger .........................................................................1
16
17
690694002
308991003
Trigger Spring .............................................................1
Front Handle Assembly (Inc. Key Nos. 18-20) ............1
18
19
20
660643008
526764002
518949001
Screw (1/4-20 x 40 mm, Cap Hex Hd.) ......................1
Front Handle ...............................................................1
Wing Nut (1/4-20) .......................................................1
`
NOT SHOWN
991000345 Operator’s Manual (RY251PH, 961494004)
995000050 Operator’s Manual (RY252CS & RY253SS, 961494017)
9-16-19
(Rev:03)
3
FIGURE B
ITEM NO. RY251PH
RYOBI 25cc STRING TRIMMERS – ITEM NUMBERS RY251PH, RY252CS and RY253SS
*27
26
26
28
30
29
31
25
32
23
1
22 **19
24
16
15
14
21
17
20
18
40
13 **37 38
41
42
43
**34
12
**11
9
10
35
36
39
42
44
45
3
7
52
4
6
51
46
2
8
1
53
5
33
46
47
48
49
50
54
4
RYOBI 25cc STRING TRIMMERS – ITEM NUMBERS RY251PH, RY252CS and RY253SS
PARTS LIST (FIGURE B)
19
20
21
22
23
24
25
26
27
28
29
7
8
9
10
11
12
13
14
KEY PART
NO. NUMBER DESCRIPTION
1
2
QTY
660344001 Screw w/Washer (M5 x 20 mm, T20 Torx Pan Hd.) ...........6
940627041 Logo Label (Front) .............................................................1
3
4
5
6
940654088 Combustion Warning Label ...............................................1
310304006 Front Housing Assembly (Inc. Key Nos. 2-3).....................1
660353001 Clutch Shoulder Bolt (M6 x 22.5 mm, Hex Hd.) ................2
690696001 Curved Washer ..................................................................2
15
16
17
18
307091001 Clutch Assembly................................................................1
690695001 Washer (ID6 x OD15 x 1.2t) ...............................................2
690689001 Flywheel Nut ......................................................................1
307156001 Flywheel .............................................................................1
630002032 ** Muffler Gasket ...................................................................1
300748043 Muffler Assembly (Inc. Key Nos. 13-14) ............................1
638268001 Screen ...............................................................................1
660870001 Screw (6-20 x 1/4 in., T20 Torx Pan Hd. S.T.) ....................3
638027002 Heat Shield ........................................................................1
660347001 Screw (M5 x 50 mm, T25 Torx Pan Hd.) ............................2
307192001 Crankcase Assembly .........................................................1
308004003 Starter Cup ........................................................................1
900709007 ** Gasket ...............................................................................1
290143002 Lead Wire (Red) .................................................................1
660968004 Screw w/Washer (M4 x 22 mm, T20 Torx Pan Hd. S.T.) ....2
290143001 Lead Wire (Black) ...............................................................1
291337001 Coil Boot Assembly ...........................................................1
690969001 Washer (ID4.2 x OD10 x 1t) ...............................................2
590462001 Spacer (Phenolic) ..............................................................2
660342001 Screw (M5 x 22 mm, Soc. Hd.)..........................................2
870174002 * Spark Plug (Torch L7RTC) .................................................1
642368001 Cylinder .............................................................................1
307157002 Rear Housing and Starter Assembly
(Inc. Key Nos. 31-32) .........................................................1
48
49
50
51
52
53
54
36
37
38
39
40
41
42
43
KEY PART
NO. NUMBER DESCRIPTION
30
31
QTY
660563002 Screw (M4 x 18 mm, T20 Torx Pan Hd. S.T.) .....................3
941788001 Primer Bulb Location Label ...............................................1
32
33
34
35
940627042 Logo Label (Rear) ..............................................................1
660970002 Shoulder Screw (M4 x 14 mm, T25 Torx Truss Hd. S.T.) ...3
903279002 ** Insulator Gasket ................................................................1
528275001 Heat Dam Insulator ............................................................1
44
45
46
47
T662210002 Screw (M5 x 30 mm, T25 Torx Pan Hd. S.T.) .....................2
903034001 ** Gasket ...............................................................................1
307160011 Carburetor Assembly (Inc. Key No. 39) .............................1
563841001 Carburetor O-Ring .............................................................1
307191001 Airbox Base Assembly (Inc. Key Nos. 41-45) ....................1
591442001 Choke Lever ......................................................................1
678515015 Compression Limiters........................................................2
591440001 Air Box Base ......................................................................1
590946001 Choke Plate .......................................................................1
660345001 Screw (M4 x 12 mm, T20 Torx Pan Hd. S.T.) .....................1
660454015 Screw (M5 x 44 mm, T20 Torx Pan Hd.) ............................2
560873001 Air Filter .............................................................................1
940647111 Choke Position Label ........................................................1
308649003 Airbox Cover (Inc. Key Nos. 48 & 50) ................................1
940686168 Starting Instructions Label ................................................1
308682055 Fuel Tank and Cap Assembly
(Inc. Key Nos. 52-54) .........................................................1
310976001 Fuel Filter ...........................................................................1
310816018 Fuel Cap Assembly............................................................1
940864004 Fuel Mixture Label .............................................................1
Not Shown:
000998930 Spark Arrestor Kit (Inc. Key Nos. 13-14)
120900307 High Altitude Kit (Not Included)
* Standard Hardware Item – May Be Purchased Locally
** Non-Reuseable Parts = Keys 11, 19, 34 and 37
5
17
9
11
RYOBI 25cc STRING TRIMMERS – ITEM NUMBERS RY251PH, RY252CS and RY253SS
12
18
13
9
17
14
8
16
7
6
12 13
15
19
15
5
11
4
10
10
3
16
2
1
KEY PART
NO. NUMBER DESCRIPTION QTY
1 311759013 Trimmer Head Assembly (.095) (Inc. Key Nos. 2-8) ................ 1
2 530366001 Lower Housing ....................................................................... 1
3 530455002 Bump Knob (Green) ................................................................ 1
4 530670001 Spool ...................................................................................... 1
5 529803001 String Guide ............................................................................ 1
6 678749001 Compression Spring ............................................................... 1
7 662569001 Hex Nut (M8) ........................................................................... 1
8 530001004 Upper Housing ....................................................................... 1
9 660647001 Screw (#10-32 x 3/8 in., Hex Washer Hd. S.T.) ...................... 1
10 638001001 Clamp ..................................................................................... 1
11 940726013 Expand-it Label ...................................................................... 1
12 940657165 Warning Icon Label ................................................................. 1
13 518019002 Storage Hanger Cap ............................................................... 1
14 307486002 Curved Shaft Assembly (Inc. Key Nos. 9-13) ......................... 1
15 308744010 Grass Deflector Assembly (Inc. Key No. 16) .......................... 1
16 205012001 Fastener Kit ............................................................................ 1
17 532048001 Crank Handle Assembly ......................................................... 1
14
1
7
4
6
5
3
2
8
KEY PART
NO. NUMBER DESCRIPTION QTY
1 311759014 Trimmer Head Assembly (.095) (Inc. Key Nos. 2-8) .............1
2 530366001 Lower Housing ......................................................................1
3 530455002 Bump Knob (Green) ..............................................................1
4 530670001 Spool .....................................................................................1
5 529803001 String Guide ..........................................................................1
6 678749001 Compression Spring .............................................................1
7 662568002 Hex Nut (M8, L.H. Thread) ....................................................1
8 530001004 Upper Housing ......................................................................1
9 532048001 Crank Handle Assembly ........................................................1
10 678011001 Flanged Washer ....................................................................1
11 308210009 Gear Case Assembly .............................................................1
12 660642001 Screw (1/4-20 x 1-1/4 in., Hex Washer Hd. S.T.) .................1
13 660641001 Screw (10-24 x 5/8 in., Hex Washer Hd. S.T.) ......................1
14 308473005 Grass Deflector Assembly (Inc. Key No. 15) .........................1
15 660886001 Wing Screw (1/4-20 x 7/8 in.) ................................................1
16 940726013 Expand-it Label .....................................................................1
17 940657165 Warning Icon Label ...............................................................1
18 518019002 Storage Hanger Cap .............................................................1
19 308035047 Straight Shaft Assembly (Inc. Key Nos. 16-18) .....................1
6
