Univex SRM20 Service Manual

MECHANICS

SRM20

MAINTENANCE
MANUAL

SRM20 - SRMF20
(SRM20 - SRMF20) less hub

SRM20/0799 ED2

0011021

- SRMF20

TABLE OF CONTENTS

DESCRIPTION PAGE

TROUBLE SHOOTING GUIDE 3
REMOVAL OF TOP COVER 4
MECHANICS MAINTENANCE 4- 5
REPAIR INSTRUCTIONS 6- 10
REPLACEMENT PARTS, LISTS 11-22
WIRING DIAGRAMS 23 -25

LIST OF ILLUSTRATIONS

ILLUSTRATION PAGE

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 16
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,

220-240V, 50HZ, 1PH, 100V, 50/60HZ, 1PH 23

FIGURE 13B WIRING DIAGRAM 115V, 60HZ, 1PH, CANADIAN ONLY

220-240V, 50HZ, 1PH, EUROPE ONLY 24

FIGURE 13C WIRING DIAGRAM 380-400V, 50HZ, 3PH EUROPE ONLY 25

Page 1

OVERALL VIEW OF FOOD MIXER

Figure 1

SRM20 - SRMF20

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

Page 2

SRM20/SRMF20 TROUBLESHOOTING GUIDE

NG not mounted

Mixer runs but

While mixer running, move speed control

Speeds will not

contact bottom

between bottom of bowl and

Misalignment of transmission

Lack of adequate lubricant on

TROUBLE POSSIBLE CAUSE REMEDY

SRM20 - SRMF20

1. Mixer will not

operate.

2.
beater will not
turn.

3. Slippage of
agitator during
mixing.

4.

change.

1.1 Electrical service down

1.2 Burned switch contacts

1.3 Timer not turned on

1.4 Motor capacitor defective

1.5 Burned out motor

1.6 SAFETY RI
and closed.

1.7 Bowl not raised

2.1 Speed changed while

mixer not running

2.2 Broken or slipping belt

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