Univex SRM12 Service Manual

MECHANICS

MANUAL

SRM12

MAINTENANCE

SRM12

(SRM12 ) less hub

SRM12/298001 ED1

0011013

TABLE OF CONTENTS

ILLUSTRATION

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

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

SRM12

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. SPEED CONTROL LEVER 19. BOWL SUPPORT PIN

9. TIMER (OPTIONAL) 20 BOWL MOUNTING BRACKET

10. SPEED INDICATOR LABEL 21. LOWER MOUNTING BRACKET

11. CORD

Page 2

TROUBLESHOOTING GUIDE

to be repacked with

Badly worn or frayed drive belts

bowl per table of mixing

TROUBLE POSSIBLE CAUSE REMEDY

SRM12

1. Mixer will not
operate

2. Mixer runs but
beater will not turn

3. Slippage of agitator
during mixing

4. Speeds will not
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 RING not mounted
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 While mixer is running,

move speed control
lever slowly forward
then back

2.2 Tighten or replace

2.3 Locate by step

inspection and replace
defective part.

3.1 Tighten belts.

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
contact bottom of
bowl

6. Excessive noise 6.1 Gears need

7. Difficulty in raising
or lowering bowl

5.1 Dented bowl

5.2 Insufficient clearance between
bottom of bowl and beater

5.3 Misalignment of transmission in
relation to bowl support

grease

6.2

6.3 Attachments hitting bowl

6.4 Overloaded mixing bowl

7.1 Lack of adequate lubricant on
bowl lift slide assembly and
housing

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
capacities.

7.1 Lubricate with grease
per Figure 2.

Page 3

SRM12

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

forward about

3

inches and lift cover off

b.

for overheating, noise and excessive end play. Replace if

qt. batter beater on

or

a. The top cover (Fig. 12 [12]) 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]),

b. Re-install in reverse procedure using care to insure that the cover sits squarely

Every six months a mechanic should perform the following inspection and maintenance as
required:

1. BELT

2 MOTOR

and uniformly on the mixer housing.

MECHANICS MAINTENANCE

a. WARNING: Start mixer and adjust speed control (Fig. 1 [8]) to speed 4. Stop

mixer. FOR SAFETY, DISCONNECT POWER.

Remove top cover (Fig. 12 [12]) and rear access panel (Fig. 12 [23]).

c. Check belt (Fig. 11 [2]). If broken, glazed or worn, replace.

d. Check belt (Fig. 11 [2]) for proper tension. The outer edge of the belt should be

flush with the outer diameter of the variable speed pulley (Fig. 11 [1]). If not,
adjust by loosening the jam nut (Fig. 11 [11]) 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.

Check motor (Fig. 11 [19])
defective.

3 BOWL LIFT - ADJUSTMENT: (Fig. 8 and 9)

a. Place 12 qt. mixing bowl (Fig. 1 [18]) on bowl support and 12

beater shaft (Fig. 1 [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 bolts (Fig. 9 [10]) and raise

lower bowl until desired clearance is obtained. Retighten bolts.

Page 4

SRM12

4 LUBRICATION

The lubrication instructions are in Fig. 2. The transmission and beater head gearing are
packed with Nevastane 5P7 grease. They must be re-packed 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 INSTRUCTION

Figure 2

Page 5

SRM12

REPAIR INSTRUCTIONS

Removal

1.

securing transmission housing to

retaining

bearing and gear

(including disassembly, replacement and reassembly.)

TRANSMISSION (Fig. 3)

Disassembly

WARNING: Disconnect power for safety.

2. Remove housing top cover (Fig. 12 [12]).

3. Adjust speed control to high speed; loosen belt retainer (Fig. 11 [14]), remove V­belt (Fig. 11 [2]) from transmission drive pulley (Fig. 11 [3]). Remove drive pulley
and key (Fig. 11 [1]), loosen set screws on mounted bearing (Fig. 6 [8]).

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 towards 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.

1. Beater Head Assembly (Fig. 4)

Page 6

a. Remove cap screw (Fig. 4 [13]) and remove beater head assembly using

jacking screws (Fig. 4 [10]) if necessary. NOTE: Screw [13] has left handed
thread.

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 and bearings from housing
(11).

c. Press bearings (4 & 8) along with spacer (9) from shaft (2).
NOTE: If gear (Fig. 4 [ 6]) requires replacement, replace internal gear (Fig.

3 [13]) also.

2. Power Take Off Assembly (Fig. 5)
a. Remove three cap screws (Fig. 5 [8]), washers (6 & 7), deflector (5)

ring (3), gear (12) and withdraw assembly from housing.

b. Remove adapter (2), retaining ring (10) and press shaft (13)

assembly from housing (4).

c. Remove pin (17), gear (11), remaining rings (3), key (14) and press bearings

(9) from shaft (13).

NOTE: If gear (Fig. 5 [11]) requires replacement, replace gear (Fig. 7 [1])

also.

SRM12

proved cleaning solvent.

If shafts have become slightly scored during the disassembly process, polish

e

Transmission should be progressively checked for smooth operation while on

Lubrication of the transmission should be done following its installation on the

evastane 5P7 grease to the spur gear and bevel gear meshes.

3. Input Assembly (Fig. 6)
a. Remove retaining ring (Fig. 6 [6]) and withdraw assembly from transmission.

b. Remove retaining ring (1), and press bearing (2) from shaft (7) .
c. Remove retaining rings (3) and slide gear (4) from shaft (7).

d. Remove Woodruff key (13) and press bearing (5) from shaft (7).
NOTE: If gear (Fig. 6 [4]) requires replacement, replace gear (Fig. 5 [12])

4. Vertical Shaft Assembly (Fig 7)

a. Remove key (4).
b. Invert housing on suitable support and press shaft (2) from transmission

Reassembly

housing (Fig. 3 [1]).

c. Remove lower bearing (5) 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).

a. Clean all components except bearings with safety ap

Inspect components for defects and replace those found to be defective.
NOTE: All gears should be replaced as sets.

also.

b.

the shafts with fine machinist 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 th
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.

the workbench by hand turning each assembly as it is installed.

e.

mixer. Apply N
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.

Page 7