2.3 Key or Pin sheared on
input shaft input gear,
bevel pinion, vertical
shaft or beater shaft.
3.1 Loose belts
3.2 Mixer bowl is over-loaded
3.3 Speed is set too high for
the mix
4.1 Loose belts
4.2 Vari-speed pulley inoperable.
1.1 Check electrical service. Replace
fuse or reset circuit breaker as
necessary.
1.2 Replace.
1.3 Turn timer on.
1.4 Replace
1.5 Remove, test, repair or replace.
1.6 Install SAFETY RING ASSY
1.7 Raise bowl completely
2.1
lever slowly forward then back
2.2 Broken or slipping belt
2.3 Locate by step inspection and replace
defective part.
3.1 Tighten belt.
3.2 Readjust contents of bowl per table of
contents.
3.3 Shift speed lower till action rotates
smoothly.
4.1 Tighten or replace
4.2 Remove, clean and lubricate or replace.
5. Attachments
of bowl.
6. Excessive noise. 6.1 Gears need to be repacked
7. Difficulty in
raising or
lowering bowl.
5.1 Dented bowl
5.2 Insufficient clearance
beater.
5.3
in relation to bowl support.
with grease.
6.2 Badly worn or frayed drive
belts.
6.3 Attachments hitting bowl
6.4 Overloaded mixing bowl.
7.1
bowl lift slide assembly and
housing.
Page 3
5.1 Remove dent or replace bowl.
5.2 Readjust bowl lift
5.3 Realign transmission.
6.1 Locate source by inspection and
repack with grease.
6.2 Replace belts.
6.3 Inspect for cause Ref: 5.1 and 5.2.
6.4 Readjust contents of bowl per table of
mixing capacities.
7.1 Lubricate with grease per Figure 2.
SRM20
- SRMF20
REMOVAL OF TOP COVER
maintenance operations. It is secured by a spring clip at its front end and a screw
lift rear of cover, push
Every six months a mechanic should perform the following inspection and maintenance as
raise or lower
for overheating, noise and excessive end play of shaft.
qt. batter beater on
a. The top cover (Fig. 12 [16]) must be removed in order to perform the
at its rearward end. First, DISCONNECT THE ELECTRICAL POWER FOR
SAFETY. Then, remove the screw in the rear (Fig. 12 [20]),
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
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]),
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])
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
beater shaft (Fig. I [1]).
b. Raise bowl support 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
4. LUBRICATION
lubricated bearings with a service interval
often years. The transmission and beater head gearing are packed with Nevastane 5p7 grease. They
NEVER WORK ON THE TRANSMISSION WITH THE MIXER RUNNING. IT IS
RECOMMENDED THAT THE ELECTRICAL SERVICE BE DISCONNECTED TO PREVENT
The lubrication instructions are in Fig. 2. Motors have pre-
must be repacked every 500 hours of operation.
WARNING:
ACCIDENTAL START UP.
LUBRICATION INSTRUCTIONS
FIGURE 2
SRM20 - SRMF20
Page 5
REPAIR INSTRUCTIONS
(Including disassembly, replacement and reassemble)
securing transmission housing to
in by hand and inspect for worn or chipped gears, bent shafts, worn
1.
and remove beater head
2.
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])
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 tra
bearings and excessive backlash. Backlash measured at gear teeth exceeding
1/32" is considered excessive. After trouble has been isolated, proceed to
disassemble.
Disassembly
Beater Head Assembly (Fig. 4)
NOTE: If a gear requires replacement, always replace it's mating gear.
SRM20 - SRMF20
a. Remove cap screw, left hand thread, (Fig. 4 [12])
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).
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
3.
from transmission
procedures stated above. Successful reassembly is very dependent on
surface of shafts. It is well to recheck
SRM20 - SRMF20
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)
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
c. Reassembly should be carried out in the reverse of the disassembly
d. Transmission should be progressively checked for smooth operation
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.
the cleanliness of all surfaces particularly the bores of housings, gears
and bearings as well as the outer
each component for cleanliness as it is picked up for reassembly. New
keys and roll pins should be used on reassembly.
while on the workbench by hand turning each assembly as it is installed.
Page 7
SRM20 - SRMF20
the mixer. Apply Keystone Nevastane 5P7 grease to the spur gear and bevel
support must be held while screws are being removed in order to
BOWL SUPPORT ASSEMBLY (Fig. 9)
SLIDE ASSEMBLY (See Fie. 9)
e. Lubrication of the transmission should be done following its installation on
gear meshes. This may be simplified by feeding the grease into the rotating
gear meshes. Caution should be exercised to avoid entrapment of the
application implement in the gear teeth. Insure the deflector (Fig. 5 [5]) is
positioned to dynamically guide the lubrication into the bevel gear mesh.
1. WARNIN G: Disconnect electrical power for safety.
2. Remove housing top cover (Fig. 12 [16]), and rear access panel (Fig. 12 [23]).
3. Remove four cap screws (Fig. 9 [15]) and remove bowl support (Fig. 9 [1]) and
slide cover (Fig. 9 [3]).
CAUTION: Bowl
prevent it from falling.
4. Reassembly is the reverse procedure.
1. Carry out above disassembly procedure for removing bowl support.
2. Remove fixed slide cover (Fig. 12 [6]) by removing two nuts. (Fig. 12 [5])
3. Remove retaining ring (Fig. 9 [8]) from rod end pin (6). Withdraw pin (6) from rod
end (7).
4. Remove four kep nuts (Fig. 9 [13]) and withdraw slide frame (5) from housing
studs.
5. Remove four cap screws (Fig. 9 [14]) and lift off gibbs (11). Remove slide (10).
6. Clean and inspect sliding surfaces for excessive wear
7. Replace parts showing excessive wear.
8. Lubricate sliding surfaces with grease.
9. Reassemble and reinstall in the reverse of the above procedure.
10. Check clearance between batter beater and bowl per Mechanics Maintenance
paragraph 3 a - d and readjust as necessary.
5. Remove nut (8) and washer (7) from studs holding speed control bearing (6)
housing (Fig. 12 [3]).
6, Withdraw bearing (6) and remaining assembly from housing (Fig. 12 [3]).
7. Pull cam assembly (11) from bearing (6).
8. Remove screws (20), lock washers (21), strap (22), and spring (19) from
bearing (6).
9. Remove screws (13) and detent disk (12).
Reassemble
10 Reassemble in reverse of above procedure. Grease cam assembly shaft
and detent disk (12) during assembly with MolyKote BR2 Plus or general
purpose bearing grease. Adjust belt as described in Mechanics Maintenance 1
paragraph a,d-f.
11 If speed control handle (1) moves while the mixer is running, tighten set screws
(10) against spring washer (9) until movement stops.
VARI-SPEED ASSEMBLY Fig. 11)
Disassembly
1. Remove housing cover (Fig. 12 [16]) and rear access panel (Fig. 12 [23]) as
described in the cover removal section.
2. Shift handle (Fig. 10 [1]) from fourth speed to first speed and back to fourth
speed with the mixer OFF. (Squeezing the belts (Fig. 11 [11 & 21]) together at
midspan will help.)
3. Unscrew nut (13) and remove washer (14) and belt retainer (15).
4. Unwrap belt (11) from pulley (12) and withdraw from vari-speed pulley (10).
5. Shift handle (Fig. 10 [1]) to first speed.
6. Unscrew nuts (13). Remove washers (14) and belt retainer (22) from mixer.
Page 9
SRM20
- SRMF20
which secure motor cord power
ground lead. Pull
Unscrew
11
speed pulley assy. from
and remove from
(20).
7. Unwrap belt (21) from pulley (27). Withdraw belt (21) from vari-speed pulley
8. Loosen screws on contactor (Fig. 12 [32])
9. Remove nuts securing motor (30) and lift motor from mixer. Loosen set
10. Remove two screws securing connection box plate on rear end of motor.
11. Loosen jam nut (Fig. 10 [15]). Loosen set screw on collar (Fig. 10 [17]).
12. Remove nuts (13) and washers (14). Withdraw vari-
13. Loosen the two set screws on each vari-speed pulley (10)
14. Remove retaining rings (6) from rod end pin (5) and bracket swivel pin
Reassemble
15. Reassemble in reverse of above procedure. Adjust belts as described in
16. Adjust upper and lower belt retainers (15 & 22) 1/8" from outer belt surface.
(10).
leads (34). Remove nut (38), lock washer (37) and motor cord ground lead
from weld stud. Remove nuts (38), washers (36) and cord clamps (35).
screw (28) and slide pulley (27) and key (29) off motor shaft.
Remove green grounding screw securing motor cord (33)
cord leads from motor terminals.
Slide collar and rod end (Fig. 10 [16]) off cam assy. (Fig. 10 [11]).
rod end (Fig. 10 [16]) and jam nut (Fig. 10 [15]) from connecting rod (Fig.
[17]). Unscrew connecting rod from rod end (Fig. 11 [7]).
mixer housing.
shaft (9). Remove woodruff keys (16) and retaining rings (1) from shaft.
Drive shaft (9) from pulley swivel bracket (4). Press remaining ball bearings
(2) from shaft (9) and from swivel bracket (4). Remove retaining rings (3)
from swivel bracket.
Drive pins (20 & 5) from swivel bracket (4) and swivel bracket base (18).
Mechanics Maintenance 1 paragraph a,d-f.
HOUSING(Fig 12)
For the remaining parts which have not been discussed pertain to electrical
components and the housing. Figures 12, 13A, 13B, and 13C should provide
adequate guidance for the disassembling and reassembling of these parts.
IMPORTANT: Before making electrical connections, check the specifications on the data plate
(located on the rear access panel) to assure they agree with those of your electrical service.
WARNING: Whenever maintenance is being performed or whenever the top cover or rear access
panel have been removed, DISCONNECT electrical cord and place a tag on it indicating the mixer is
being wo rked on.
IMPORTANT: Before making electrical connections, check the specifications on the data plate (located
on the rear access panel) to assure they agree with those of your electrical service.
WARNING: Whenever maintenance is being performed or whenever the top cover or rear access panel
have been removed, DISC ONNECT electrical cord and place a tag on it indicating the mixer is being
worked on.
IMPORTANT: Before making electrical connections, check the specifications on the data plate
(located on the rear access panel) to assure they agree with those of your electrical service.
WARNING: Whenever maintenance is being performed or whenever the top cover or rear
access panel have been removed, DISCONNECT electrical cord and place a tag on it indicating
the mixer is being worked on.
Page 25
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