MECHANICS |
SRM20 - SRMF20 |
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MAINTENANCE |
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(SRM20 - SRMF20) less hub |
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MANUAL |
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SRM20/0799 |
ED2 |
0011021
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SRM20 - SRMF20 |
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TABLE OF CONTENTS |
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DESCRIPTION |
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PAGE |
TROUBLE SHOOTING GUIDE |
3 |
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REMOVAL OF TOP COVER |
4 |
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MECHANICS MAINTENANCE |
4- 5 |
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REPAIR INSTRUCTIONS |
6- 10 |
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REPLACEMENT PARTS, LISTS |
11-22 |
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WIRING DIAGRAMS |
23 -25 |
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LIST OF ILLUSTRATIONS |
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ILLUSTRATION |
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FIGURE 1 |
OVERALL VIEW OF MIXER |
2 |
FIGURE 2 |
LUBRICATION INSTRUCTIONS |
5 |
FIGURE 3 |
TRANSMISSION |
11 |
FIGURE 4 |
BEATER HEAD ASSEMBLY |
12 |
FIGURE 5 |
POWER TAKE OFF ASSEMBLY |
13 |
FIGURE 6 |
INPUT ASSEMBLY |
14 |
FIGURE 7 |
VERTICAL SHAFT ASSEMBLY |
15 |
FIGURE 8 |
BOWL LIFT ASSEMBLY |
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FIGURE 9 |
BOWL SUPPORT ASSEMBLY |
17 |
FIGURE 10 |
SPEED CONTROL ASSEMBLY |
18 |
FIGURE 11 |
VARI SPEED AND DRIVE SYSTEM |
19 -20 |
FIGURE 12 |
HOUSING ASSEMBLY |
21 -22 |
FIGURE 13 A |
WIRING DIAGRAM 115V, 208-230V 60HZ 1PH, |
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220-240V, 50HZ, 1PH, 100V, 50/60HZ, 1PH |
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FIGURE 13B |
WIRING DIAGRAM 115V, 60HZ, 1PH, CANADIAN ONLY |
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220-240V, 50HZ, 1PH, EUROPE ONLY |
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FIGURE 13C |
WIRING DIAGRAM 380-400V, 50HZ, 3PH EUROPE ONLY |
25 |
Page 1
SRM20 - SRMF20
OVERALL VIEW OF FOOD MIXER
Figure 1
1. BEATER SHAFT |
12. START BUTTON |
2. CHUTE |
13. STOP BUTTON |
3. SAFETY RING ASSEMBLY |
14. BOWL LIFT HANDLE |
4. MAGNET |
15. REAR ACCESS PANEL |
5. NO. 12 HUB |
16. CAP (COVERS SHIPPING BOLT HOLE) |
6. THUMB SCREW |
17. BOWL SUPPORT |
7. UPPER MOUNTING BRACKET |
18. BOWL |
8. TIMER (OPTIONAL) |
19. BOWL SUPPORT PIN |
9. SPEED CONTROL LEVER |
20. BOWL MOUNTING BRACKET |
10. SPEED INDICATOR LABEL |
21. LOWER MOUNTING BRACKET |
11. CORD |
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Page 2 |
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SRM20 - SRMF20 |
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SRM20/SRMF20 TROUBLESHOOTING GUIDE |
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TROUBLE |
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POSSIBLE CAUSE |
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REMEDY |
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1. Mixer will not |
1.1 |
Electrical service down |
1.1 |
Check electrical service. Replace |
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operate. |
1.2 |
Burned switch contacts |
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fuse or reset circuit breaker as |
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1.3 |
Timer not turned on |
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necessary. |
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1.2 |
Replace. |
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1.4 |
Motor capacitor defective |
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1.3 |
Turn timer on. |
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1.5 |
Burned out motor |
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1.4 |
Replace |
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1.6 |
SAFETY RING not mounted |
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1.5 |
Remove, test, repair or replace. |
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and closed. |
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1.7 |
Bowl not raised |
1.6 Install SAFETY RING ASSY |
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1.7 |
Raise bowl completely |
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2. Mixer runs but |
2.1 Speed changed while |
2.1 While mixer running, move speed control |
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beater will not |
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mixer not running |
lever slowly forward then back |
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turn. |
2.2 Broken or slipping belt |
2.2 Broken or slipping belt |
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2.3 Key or Pin sheared on |
2.3 Locate by step inspection and replace |
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input shaft input gear, |
defective part. |
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bevel pinion, vertical |
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shaft or beater shaft. |
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3. Slippage of |
3.1 |
Loose belts |
3.1 Tighten belt. |
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agitator during |
3.2 |
Mixer bowl is over-loaded |
3.2 Readjust contents of bowl per table of |
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mixing. |
3.3 |
Speed is set too high for |
contents. |
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the mix |
3.3 Shift speed lower till action rotates |
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smoothly. |
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4. |
Speeds will not |
4.1 |
Loose belts |
4.1 Tighten or replace |
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change. |
4.2 |
Vari-speed pulley inoperable. |
4.2 Remove, clean and lubricate or replace. |
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5. |
Attachments |
5.1 |
Dented bowl |
5.1 Remove dent or replace bowl. |
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contact bottom |
5.2 |
Insufficient clearance |
5.2 Readjust bowl lift |
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of bowl. |
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between bottom of bowl and |
5.3 Realign transmission. |
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beater. |
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5.3 |
Misalignment of transmission |
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in relation to bowl support. |
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6. Excessive noise. |
6.1 Gears need to be repacked |
6.1 Locate source by inspection and |
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with grease. |
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repack with grease. |
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6.2 |
Badly worn or frayed drive |
6.2 Replace belts. |
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belts. |
6.3 Inspect for cause Ref: 5.1 and 5.2. |
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6.3 |
Attachments hitting bowl |
6.4 Readjust contents of bowl per table of |
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6.4 |
Overloaded mixing bowl. |
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mixing capacities. |
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7. Difficulty in |
7.1 |
Lack of adequate lubricant on |
7.1 Lubricate with grease per Figure 2. |
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raising or |
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bowl lift slide assembly and |
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lowering bowl. |
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housing. |
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Page 3
SRM20 - SRMF20
REMOVAL OF TOP COVER
a.The top cover (Fig. 12 [16]) must be removed in order to perform the maintenance operations. It is secured by a spring clip at its front end and a screw at its rearward end. First, DISCONNECT THE ELECTRICAL POWER FOR SAFETY. Then, remove the screw in the rear (Fig. 12 [20]), lift rear of cover, push forward about 3 inches and lift cover off.
b.Re-install in reverse procedure using care to insure that the cover sits squarely and uniformly on the mixer housing.
MECHANICS MAINTENANCE
Every six months a mechanic should perform the following inspection and maintenance as required:
1.BELTS
a. WARNING: Start mixer and adjust speed control (Fig. 1 [9]) to speed 4. Stop
mixer. FOR SAFETY, DISCONNECT POWER.
b.Remove top cover (Fig. 12 [16]) and rear access panel (Fig. 12 [23]).
c.Check belts (Fig. 11 [11 & 21]). If broken, glazed or worn, replace.
d . Check belt (Fig. 11 [11]) for proper tension. The outer edge of the belt should be flush with the outer diameter of the variable speed pulley (Fig. 11 [10]). If not, adjust by loosening the Jam Nut (Fig. 10 [15]) and turning the connecting rod (Fig. 10 [14]) until the outer edge of belt is flush with the outer diameter of the pulley. Retighten Jam Nut.
e.WARNING: Plug machine in, start mixer, and adjust speed control to speed 1.
Stop mixer. FOR SAFETY, DISCONNECT POWER.
f. Check belt (Fig. 11 [21]) for proper tension. The outer edge of the belt should be flush with the outer diameter of the variable speed pulley (Fig. 11 [10]). If not, adjust by loosening nuts (Fig. 11 [13 ]), holding motor (Fig. 11 [30]), raise or lower the motor until the outer edge of belt is flush with the outer diameter of pulley. Retighten Nuts.
2. MOTOR
Check motor (Fig. 11 [30]) for overheating, noise and excessive end play of shaft. Replace if defective.
3.BOWL LIFT ADJUSTMENT (Fig. 8 and 9)
a.Place 20 qt. mixing bowl (Fig. 1 [18]) on bowl support and 20 qt. batter beater on beater shaft (Fig. I [1]).
b.Raise bowlsupport to the high position.
c.Check clearance between bottom of bowl and lowest point of batter beater. Clearance should be 3/16 inch, plus or minus 1/16 inch.
d.If adjustment is required, disconnect power, loosen lock nut (Fig. 8 [10]) and turn linkage rod (Fig. 8 [9]) until desired clearance is obtained. Retighten lock nut.
Page 4
SRM20 - SRMF20
4. LUBRICATION
The lubrication instructions are in Fig. 2. Motors have pre-lubricated bearings with a service interval often years. The transmission and beater head gearing are packed with Nevastane 5p7 grease. They must be repacked every 500 hours of operation.
WARNING: NEVER WORK ON THE TRANSMISSION WITH THE MIXER RUNNING. IT IS RECOMMENDED THAT THE ELECTRICAL SERVICE BE DISCONNECTED TO PREVENT ACCIDENTAL START UP.
LUBRICATION INSTRUCTIONS
FIGURE 2
Page 5
SRM20 - SRMF20
REPAIR INSTRUCTIONS
(Including disassembly, replacement and reassemble)
TRANSMISSION (Fig. 3)
Removal
1.WARNING: DISCONNECT POWER FOR SAFETY.
2.Remove housing top cover (Fig. 12 [16]).
3.Adjust speed control to low speed, then back to high speed, remove upper retainer bracket (FIG. 11 [15]), and upper V-belt (Fig. 11 [11]) from transmission driven pulley (Fig. 11 [12]). Remove driven pulley.
4.CAUTION: Transmission assembly is heavy and must be supported prior to removing. Remove four cap screws (Fig. 3 [10]) securing transmission housing to mixer housing. Remove transmission assembly and place on work bench.
5.Remove transmission cover (Fig. 3 [2]) by sliding toward the rear and lifting up,
6.Rotate gear train by hand and inspect for worn or chipped gears, bent shafts, worn bearings and excessive backlash. Backlash measured at gear teeth exceeding 1/32" is considered excessive. After trouble has been isolated, proceed to disassemble.
Disassembly
1. Beater Head Assembly (Fig. 4)
NOTE: If a gear requires replacement, always replace it's mating gear.
a.Remove cap screw, left hand thread, (Fig. 4 [12]) and remove beater head assembly using jacking screws (Fig. 4 [9[) if necessary.
b.Remove drive pin (Fig. 4 [1]), top retaining ring (5), gear (6), key (3), bottom retaining ring (5), retaining ring (7) and press shaft (2) and bearing
(4) from housing (10).
c.Press bearings (4) along with spacer (8) from shaft (2).
2.Power-Take-Off Assembly (Fig. 5)
a.Remove three cap screws (Fig. 5 [8]), washers (6 & 7), deflector (5), retaining ring (3), gear (12), and withdraw assembly from housing (4).
b.Remove adapter (2), retaining ring (10) and press shaft (13) bearings (9) and gear (11) assembly from housing (4).
c.Remove pin (17), gear (11), remaining retaining rings (3), key (14) and press bearings (9) from shaft (13).
Page 6
SRM20 - SRMF20
3.Input Assembly (Fig. 6)
a.Remove two cap screws (Fig. 6 [10]) and withdraw assembly from transmission.
b.Remove retaining ring (1), gear (2), keys (5, 7), retaining rings (1) and press shaft (6) and bearing (4) from housing (8).
c.Remove retaining rings (3) and press bearing (5) from housing (6).
d.Remove retaining ring (1) and press shaft (6) from bearing (4).
4.Vertical Shaft Assembly (Fig. 7)
a.Remove key (4).
b.Invert housing on suitable support and press shaft (2) from transmission housing (Fig. 3 [1]).
c.Remove lower bearing (8) with puller and remove spacer (7).
d.Remove retaining ring (6) and pull or press upper bearing (5) from transmission housing (Fig. 3 [1]).
e.Remove pin (3) and press shaft (2) from gear (1).
REASSEMBLE
a.Clean all components except bearings with safety approved cleaning solvent. Inspect components for defects and replace those found to be defective.
NOTE: All gears should be replaced as sets.
b.If shafts have become slightly scored during the disassembly process, polish the shafts with fine machinist's crocus cloth. Use care to avoid excessive removal of shaft surface or proper fit of components will be lost.
c.Reassembly should be carried out in the reverse of the disassembly procedures stated above. Successful reassembly is very dependent on the cleanliness of all surfaces particularly the bores of housings, gears and bearings as well as the outer surface of shafts. It is well to recheck each component for cleanliness as it is picked up for reassembly. New keys and roll pins should be used on reassembly.
d.Transmission should be progressively checked for smooth operation while on the workbench by hand turning each assembly as it is installed.
Page 7
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