Bolens QS Series User manual

)
BIIIIIIIS
QS, QT & 1900
Series
Tractors
SERVICE
MANUAL
Form 552974·2 (4/83)
Supersedes 552974-1

QS, QT & 1900
Series
Tractors
I. GENERAL D
II. ELECTRICAL sYSTEM~
Ill. DRIVE CHAIN I!J
IV. FUEL SYSTEM~
V.CHASSIS~
VI. HYDRAULIC sYSTEM~
VII. ENGINE~
VIII. TRACTOR ATTACHMENTS [ :]

PAGE PAGE
GROUP I. GENERAL. .............•. 1-1 GROUP Ill. DRIVE TRAIN ........... 3-1
SERIAL NUMBER INFORMATION .. 1-1
SPECIFICATIONS ................ 1-2
MAINTENANCE CHART ........... 1-4
LUBRICATION POINTS ........... 1-5
LUBRICATION CHART ............ 1-6
GROUP II. ELECTRICAL SYSTEM ..... 2-1
TROUBLESHOOTING GUIDE ....... 2-1
ELECTRICAL WIRE COLOR GUIDE. 2-3
WIRING DIAGRAM 1660S/N 0100101
THRU 0199999 ................. 2-4
WIRING DIAGRAM 1660S/N 0200101
AND LATER ................ : . . 2-5
START AND RUN CIRCUIT 1660 .... 2-5
LIGHT CIRCUIT 1660S/N 0100101
THRU 0199999 ................. 2-6
LIGHT CIRCUIT 1660S/N 0200101
AND LATER ................... 2-7
CHARGING CIRCUIT 16600100101
THRU 0199999 ................. 2-6
CHARGING CIRCUIT 1660 0200101
AND LATER ................... 2-7
WIRING DIAGRAM 1666 S/N 0100101
THRU 0499999 ................. 2-8
WIRING DIAGRAM EARLY MODELS
1666 SERIAL NO'S 0600101 THRU 2-9
WIRING DIAGRAM EARLY MODELS
1666 SERIAL NO'S 0600101 THRU
0799999 ...................... 2-10
WIRING DIAGRAM 1666S/N 0600101
AND LATER .................. 2-11
LIGHT CIRCUIT 1666S/N 0100101
THRU 0499999 ................ 2-12
LIGHT CIRCUIT 1666 S/N 0500101
AND LATER .................. 2-12
START RUN CIRCUIT 1666
S/N 0100101 THRU 0499999 ..... 2-13
START RUN CIRCUIT 1666
S/N 0500101 AND LATER ....... 2-13
CHARGING CIRCUIT 1666S/N
0100101 THRU 0499999
......... 2-14
CHARGING CIRCUIT 1666 S/N
0500101 THRU 0599999 ......... 2-14
CHARGING CIRCUIT 1666 S/N
0600101 AND LATER .... : ...... 2-15
PTO CLUTCH CIRCUIT 1666 S/N
0100101 THRU 0499999 ......... 2-15
PTO CLUTCH CIRCUIT 1666 S/n
0500101 TH
RU 0599999 ......... 2-16
PTO CLUTCH CIRCUIT 1666S/N
0600101 AND LATER
........... 2-16
SEAT SWITCH Cl RCUIT 1666 S/N
0500101 AND LATER
........... 2-17
TESTING ELECTRICAL SYSTEM ... 2-18
TROUBLESHOOTING GUIDE ....... 3-1
PRINCIPLE OF OPERATION ....... 3-2
HYDROSTATIC TRANSMISSION
FLOW CHART
.................. 3-3
HYDROSTATIC IDENTIFICATION .. 3-4
TESTING HYDRO ................ 6-3
TRANSAXLE REMOVAL (EATON) .. 3-7
TRANSAXLE REMOVAL
(SUNSTRAND)
................ ,. 3-8
HYDRO REMOVAL ............... 3-9
HYDRO REPAIR (EATON ......... 3-10
HYDRO REPAIR (SUNSTRAND)
... 3-11
TRANSAXLE ................... 3-22
OIL SEAL INSTALLATION ........ 3-25
BEARING INSTALLATION ........ 3-28
HYDRO INSTALLATION ......... 3-29
TRANSAXLE REINSTALLATION
(EATON)
..................... 3-31
TRANSAXLE REINSTALLATION
(SUNSTRAND)
................. 3-32
GROUP IV. FUEL SYSTEM ....•.••••• 4-1
TROUBLESHOOTING GUIDE ....... 4-1
SERVICING ..................... 4-2
FUEL
VALVE ................... 4-2
DUEL
VALVE ................... 4-2
FUELFILTER .................•. 4-2
AIR CLEANER ................... 4-3
CARBURETOR ADJUSTMENTS
..... 4-4
GROUP V. CHASSIS ..••.•..••..••.• 5-1
STEERING ASSEMBLY .........•.. 5-1
HYDROSTATIC ADJUSTMENTS .... 5-4
BRAKE ASSEMBLY
............... 5-5
INTERLOCK SWITCHES ........... 5-6
POWER TAKE-OFF (P.T.O.) .....•.. 5-7
GROUP VI. HYDRAULIC SYSTEM ...•. 6-1
TROUBLESHOOTING GUIDE ....... 6-1
TESTING HYDRAULIC SYSTEM .... 6-3
HYDRAULIC POWER LIFT ......... 6-5
GROUP VII. ENGINE ......•••••.•... 7-1
TROUBLESHOOTING GUIDE ....... 7-1
QT-160NAN ENGINE ............. 7-3
QS-16 KOHLER ENGINE .......... 7-4
QT-17
KOHLER ENGINE .......... 7-5
GROUP VIII. TRACTOR ATTACH-
MENTS
.................•..... 8-1
MOWER DECKS ................. 8-1
SNOW THROWERS .............. 8-5
TILLERS . . . . . . . . . . . . . . . . . . . . . . . 8-7

Model number of Tractor. A.
Serial number of Tractor. B.
FIGURE 1-1
) tngine Model Number.
Engine Serial Number.
Engine Spec. Number.
1j1
1
I
'I
GROUP I. GENERAl OS, QT & 1900 SERIES
TRACTORS
Page 1-1 REV. 4/83
SERIAl NUMBER INFORMATION I
-
KOHLER
ENGINE
SERIAL
NUMBER
ENGINE
MODEL
AND SPEC.
NUMBER
MODELS
1660 (QS-16)
ENGINE
ONAN
ENGINE
.'l'l!!llllll MODEL
.. AND SPEC.
NUMBER
KOHLER 1666 ~17)
S/N 0600101 AND
UP
AND 1900
S/N 0100101
D UP
M0 DELlS PEG :.,....<:.;....;.;-+-'
NUMBER
FIGURE 1·4

QS, QT & 1900 SERIES
TRACTORS
Page 1-2 REV. 4/83
GENERAl (Continued)
KOHLER
ENGINE MODEL 1660
SPECIFICATIONS
MODEL 1666 (SERIAL NO'S)
0600101 AND LATER)
Manufacturer ..... Kohler Kohler
Model/Spec . . ... .. K-341 AQS Spec. 71172A & 71176A . .. ... KT 17QS Spee. 241 06A, 24152 & 24197
Type ............. Horz. shalt, air cooled 1 cyl., 4 cycle .... Horz. shalt, air cooled 2 cyl., 4 cycle
Bore and Stroke
.. 3-3/4" (95 mm) x 3-1/4" (82.5 mm) ...... 3-1/8" (79 mm) x 2-3/4" (70 mm)
Piston
Displacement
..... 35.89 cu. ln. (587 cc) ................... 42.18 cu. ln. (690 cc)
Mfr's H.P. Rating .. 16 H.P. at 3600 RPM ....•.............. 17 H.P. at 3600 RPM
Air Cleaner ....... Paper Element Kohler 4708301 ........... Paper Element Kohler 4708301
Oil Capacity ...... 1-1/2 Quarts (1.41iter) .................. 3 Pints (1.4 liter)
Governor ......... Mechanical ............................ Mechanical
Speed Control .... Remote cable operated ........•........ Remote, cable operated
Starter ............ Bendix Type ......................•.... Bendix Type ·
Charging System .. 15 Amp. flywheel Alternator ............ 15 Amp. flywheel Alternator
Spark Plug Size ... 14 mm ................................. 14 mm
Spark Plug ........ Champion H10 ......................... Champion RBL15Y
Spark Plug Gap .... 025 (0.63 mm) .......................... 025 (0.63 mm)
Breaker Point Gap .020 (0.5 mm)
........................... 020 (0.5 mm)
Timing ........... S Mark In Timing Hole ................. SP Mark in Timing Hole
ENGiNE
Manufacturer
Model/Spec
.... .
Type
.......... .
Bore and Stroke .
Piston
Displacement
....
Mlr's H.P. Rating
Air Cleaner
Oil Capacity
Governor
...... .
Speed Control .. .
Starter ........ .
Charging System .
Spark Plug Size ..
Spark Plug ..... .
Spark Plug Gap ..
Breaker Point Gap
Timing
........ .
MODEL 1966 (SERIAL NO'S)
0100101 AND LATER)
Kohler
KT 19QS Spec. 49139
Harz. shalt, air cooled 2 cyl., 4 cycle
3-1/8" (79 mm) x 3-1/16 (78.0 mm)
47 cu. in. (770 cc)
19 H.P. at 3600
RPM
Paper Element Kohler 4508302 with
Precleaner 5208302
1-1/2 Qts. (1.421iter)
Mechanical
Remote, cable operated
Bendix Type
15 Amp. flywheel Alternator
14 mm
Champion RBL15Y
.025 (0.63 mm)
.020 (0.5 mm)
SP Mark in Timing Hole

\
GENERAl (Continued) OS, QT &1900 SERIES
TRACTORS
Page 1-3 REV. 4/83
ONAN
ENGINE
Manufacturer ..... On an
SPECIFICATIONS
MODEL 1666 (SERIAL NO'S
0100101 THRU 0599999)
Model/Spec ....... . -:-:-:-:-: .. ................................. BF/MS Spec. 2425 A thru C, 2938 D &
E&3283F
Type ..........•..............................•............ Harz. shaft, air cooled, 2 cyl., 4 cycle
Bore and Stroke ........................................... 3-1/8" (79 mm) x 2-5/8" (66.6 mm)
Piston Displacement
....................................... 40.3 cu. ln. (660 cc)
Mfr's H.P. Rating
........................................... 16 H.P. at 3600 RPM
Air Cleaner ................................................. Paper Element B140-1216
Oil Capacity ............................................... 2 Quarts (1.9 liter)
Governor ................................................... Mechanical
Speed Control
............................................. Remote, cable operated
Starter
..................................................... Bendix Type
Charging System
.............................••........... 15 Amp. flywheel alternator
Spark Plug Size
............................................ 14 mm
Spark Plug ................................................ Champion H8
Spark Plug Gap ............................................. 025 (0.63 mm)
Breaker Point Gap
.......................................... 020 (0.5 mm)
Timing
.................................................... 25° B.T.D.C.
I
) CHASSIS
Type .. .. .. ... . ... .. .. .. . . . .. . .. .. .. . . .. . . . . . .. .. . . . .. . . .. .. .. •. . .. . ... . . .. . ... . Steel, formed frame
Length
.......................................................................... 70-1/2 in. (179 em)
Width- With Terra Tires ....................................... Wheels turned in- 30-1/4 in. (76.8 em)
Wheels turned out- 40-1/2 in. (103 em)
Height
.............................................................................. 45 in. (114 em)
Wheel Base ...................................................................... 48-1/2 in. (123 em)
Turning Radius
...................................................................... 59 i,n. (150 em)
Ground
Clearance- Transaxle Center ............................................... 7-1/2 in. (19 em)
Shipping Weight
......•......................•.•.......................•..•.....•.. 850 lbs./ (385 kg)
Transmission
....................•....... (1660 & 1666 series 0100101 thru 049999.9- Sundstrand In-Line)
(1666 Series 0500101 and later, 1966- Model11 Eaton)
Transmission Oil Capacity
..•......•......•.....••.................•.....•........•......•• 10 Quarts
Speed Infinitely Variable ........................................... Forward -0-8 mph (0-12.8 km/hr)
Reverse -0-4 mph (0-6.4 km/hr)
Brakes ..............••..........................................•...............•.•........... Disc

QS, QT & 1900 SERIES
TRACTORS
Page 1-4 REV. 4/83 GENERAL (Continued)
MAINTENANCE CHART
MAINTENANCE REQUIRED Length
of
Type of
Operation Maintenance
Engine Cooling Air Screen -Daily
or
Brush Clean
10 Hrs.•
Engine Air Cleaner -50 Hrs.• Shake Out Dirt
25 Hrs. Clean Precleaner
(if equipped)
100 Hrs.' Replace Element
Cooling Fins -(Engine) -Daily or
Clean- Use
. 100 Hrs. Air Hose if
Available
Spark Plugs -100
Hrs.
Service or
Replace
Breaker Points -200 Hrs. Service or
Replace
Ignition Timing -100 Hrs. Adjust
Engine Valve Tappets -400
Hrs.
Adjust
Power- Take-Off- 1666 S/N 0200101 and later 100 Hrs.' Check and
1660 Adjust Brake
1966 ..,
Fuel Filter -100
Hrs.
Clean if two piece.
replace
if one piece
·Battery -Daily Check electrolyte
level -
Add water
as Necessary
Hydrostatic
Transmission-
Clean- Use
50 Hrs.' Air Hose if
Available
Belts- Check for
50 Hrs.' Wear and
Adjust
Tires-
Check lor
25 Hrs. Damage and Air
Pressure
Transmission Filter -After First 5 Change and
Add oil to
Hours then After Bring to Operating
Every 100 Hrs.' Level (Use
only Bolens
Filter)
Brakes- 50 Hrs.' Check lor wear
and Adjust
..
'More often under extreme cond1t1ons .

)
GENERAl (Continued)
MODEL
1966
SHOWN
QS, QT & 1900 SERIES
TRACTORS
Page 1-5 REV. 4/83[

QS, QT & 1900 SERIES
TRACTORS
Page 1-6 REV. 4/83
GENERAl (Continued)
LUBRICATION CHART
LUBRICATION REQUIRED
1.
Engine Crankcase -
(Spring, Summer,
Autumn)
(+120° F. to 30° F)
49° F to -1 oC
Average (Winter)
Tempersture (+30° ro
oo F.)
-1°C to -18°C ·
(Winter)
(Below
oo F.)
Below -18°C
0
L.
Hydrostatic Transmission -
(Capacity 10 qts.)
3. Front Wheel Bearings -
4.
Front Wheel Spindles -
5.
Front Axle Pivot -
6. Steering Shaft -
7. Pivot Shaft -
8. Brake Linkage.-
9.
Travel Pedal Shaft -
10.
Hydrostatic Control Arms -
..
*More often under extreme cond1t1ons.
**Or equivalent
Length of
Operation
Daily &
10 Hrs.
On an
50 Hrs:
Kohler
25 Hrs:
On an
50 Hrs:
Kohler
25 Hrs•
On
an
50 HRS.'
Kohler
25 Hrs:
Check Weekly
Or 30 Hrs.
When Oil is
Discolored
Once a year
30 Hrs.
Or
Once a Year
30 Hrs.
Or
Once a Year
30 Hrs.
Or
Once a Year
30 Hrs.
30 Hrs.
30 Hrs.
Or Once a Year
30 Hrs.
Type of
Lubrication
Engine Oil
SAE 30 Oil Type
SE-SC
SAE 10W30
or 10W40
TYPE SC, CC, SD or SE
SAE 10W30 Oil
TYPE SE-CC
SAE 5W30
or 5W20
TYPE SC, CC, SD or SE
SAE 5W-20 Oil
TYPE SE-CC
SAE 5W-30
or 5W20
TYPE SC, CC, SD or SE
With Sunstrand Hydro's
Type
"F" Automatic
Transmission Fluid
With Eaton Hydro's
SAE 20, Oil
Drain and refill with:
(Type
"F" Automatic
Transmission Fluid with
Sunstrand Hydros)
(SAE 20 Oil with Eaton
Hydros)
Wheel Bearing
Grease
Grease With
Multi Purpose
..
Grease With
Multi Purpose
••
Grease With
Multi Purpose
••
Oil
Oil
Oil
Light Machine
Oil
Amount
Required
Add Oil
To Full Mark
Replace
Onan 2 Qts(1.9 liter)
Kohler
(K 341)
1-1/2 Qts. (1.4 liter)
Kohler (KT
17)
3-1/2 pints (1.7 liter)
Kohler
(KT 19)
1-1/2 Qts. (1.41iter)
Level must be
maintained
in
the operating
zone
Pack
1-2 Strokes
1-2 Strokes
1-2 Strokes
Small Amount
Small Amount
Small Amount
Small Amount
NOTE: A hand grease gun is recommended when greasing your unit. Lubricate all linkages, levers, and pins
not equipped with grease fittings with
an oil can once aweek, or oftener depending on operating conditions.
C)

)
GROUP II: ElECTRICAl SYSTEM QS, QT & 1900 SERIES
Page 2-1 REV. 12/78
TROUBLE SHOOTING GUIDE
PROBLEM PROBABLE CAUSE REMEDY
Starter Motor does not 1. Attachment drive engaged. 1. Disengage PTO.
energize and solenoid
does not click.
2. Brake pedal not depressed. 2. Depress brake pedal.
3. Corroded or loose electrical solenoid 3.
Clean and tighten Red/White
connections. wire
at solenoid.
4. Inoperative switches· Attachment
4. Check
and replace if neces·
drive, brake and key switch. sary. (Refer to switch test·
ing.)
5. Inoperative key switch.
5.
Check and replace if neces·
sary. (Refer to solenoid
testing.)
6. Defective key switch.
6.
Check and replace if neces·
sary. (Refer to ignition
switch test.)
Starter Motor does not 1. Discharged battery. 1. Charge battery.
energize but solenoid
clicks.
2.
Corroded or loose electrical connections
2. Check solenoid or starter.
on solenoid, or starter.
3. Inoperative solenoid.
3.
Check and replace if neces·
sary.
Engine
cranks slowly. 1.
Weak or discharged battery.
1. Check battery, charge or
replace if necessary.
2.
Corroded or loose electrical connections
2. Clean and tighten.
at battery.
Battery discharges
1. Low water level. 1. Check and refill.
rapidly.
2. Inoperative battery. 2. Check and replace if neces·
sary.
Battery will not
1.
Corroded or loose battery cables.
1. Clean and tighten.
charge.
2. Inoperative battery.
2. Replace battery.
3.
Inoperative diode or rectifier/regu Ia tor. 3. Check diode
and replace if
necessary.
Check rectifier/
regulator by substitutions.
(Refer to diode test.)

QS, QT & 1900 SERIES
TRACTORS
Page 2-2 REV. 4/83
PROBLEM
Lights not operating.
Attachment drive
inoperative (Attach-
ment drive light
works). (QT-1666 &
1966 series only)
Attachment drive
inoperative (Attach-
ment light inoper-
ative). (QT-1666 &
1966 series only)
Engine kills when
Attachment drive
switch
in turned on.
.
Continued operation
of attachments when
operator is
not seated.
(1666-05001
01 and
later)(1966)
ELECTRICAL SYSTEM (Continued) )
TROUBLE SHOOTING GUIDE
PROBABLE CAUSE REMEDY
1. Bulbs burned out.
1. Replace.
2.
Loose or poorly connected white 2.
Install properly and tighten.
wires or
poor black ground wire.
3.
Bad light switch. 3. Check.
1.
Broken or loose wires.
1.
Check purple wire between
PTO switch and electric
clutch.
2. Inoperative electric clutch.
2.
Replace.
1. Inoperative Attachment drive switch. 1. Check and replace of nee-
essary. Refer
to Attach-
ment switch test.
2. Broken red wire between Attachment 2.
Check and replace of nee-
drive switch and key switch. essary.
1. No operator in seat.
1. Seat switch must be acti-
vated
either by operator in
seat or the interlock switch
button pulled up.
2. Seat switch is not adjusted properly.
2. Adjust so switch is engaged
when operator
is seated.
1. Seat switch
is not adjusted correctly.
1. Adjust so switch is dis-
engaged when operator is
not seated.
2. Inoperative seat switch.
2.
Check and replace if nee-
essary. Refer to seat switch
test.
3. Broken seat switch wires.
3.
Connect or repair blue
wires between seat switch
and
Attachment drive
switch.
4. Inoperative Attachment drive switch. 4. Check and replace if nee-
(QT 1666 Series only) essary. Refer
to Attach-
ment drive switch test.
5. Inoperative condenser.
5. Check and replace if
necessary.
CJ

)
ElECTRICAl SYSTEM (Continued) QS, QT & 1900 SERIES
Page 2-3 REV. 12/78
ElECTRICAl SYSTEM WIRE COLOR CODE
COLOR
Black
Black/Yellow
Red
Red/White
Red/Black
Red/Yellow
Orange
Yellow
Yellow/Red
Blue
Blue/Black
White
White/Green
White/Blue
White/Red
White/Black
Brown
Brown/Orange
Brown/Yell ow
Purple
Green
Gray
FUNCTION
Ground
Solenoid Ground
Switched 12 Volts
Amp Meter Pos. Terminal
Amp Meter Neg. Terminal
Start Circuit
Ignition Circuit
Stator Leads
Stator Leads
Stop Circuit
Safety Interlock
Lights
Hi Beam
Lo Beam
Brake Light
Back Up Light
Tach
Tach
Signal
Tach Signal
P.T.O.
Clutch
Temperature
Oil Pressure
EXPLANATION
Lead between solenoid and ground switch
11
Run" or "On" Key Position
For Amp Meter polarity indication
Amp Meter polarity indication
12 Volts
start position only
12 Volts during run and start position
To indicate polarity on 2nd wire
From engine kill circuit
Accessory
Stop Circuit
Function of light circuit
Function of light circuit
Function of light circuit
Function of light circuit
Obtained from 12 volt ignition coil
Obtained from stator
Lead used between sender and indicator
Lead used between sender and indicator
Some of the products from Vendors will not match our color system. Generally the Vendor uses black
wire; however, we will
try to interrupt this difference by using a connector located near the Vendor item.

QS, QT & 1900 SERIES
Page 2·4 REV. 12/78
-
R
+
w
w
ELECTRICAl SYSTEM (Continued)
WIRING DIAGRAM
1660 S/N 0100101 THRU 0199999
1. ENGINE
2.
IGNITION COIL
3.
STARTER
4. SOLENOID
5. BATTERY
R/Y
6.
P.T.O. INTERLOCK
SWITCH
7. BRAKE INTERLOCK
SWITCH
8. CONNECTOR
9. REGULATOR/RECTIFIER
0 10. AMMETER
11.
CIRCUIT BREAKER -
20AMP
12.
IGNITION SWITCH
13.
LIGHT SWITCH
14.
HEADLIGHTS
15.
TAILLIGHTS (OPTIONAL)
16. HOURMETER
(OPTIONAL)
17. CONNECTORS
(NOT
USED ON 1660)
18. SWITCH
(NOT USED
ON 1660)
R/B WIRE COLORS J
R R
0- ORANGE
R -RED
Y- YELLOW
R
B- BLACK
w W
-WHITE
P- PURPLE
R/Y -RED/YELLOW
R/W -RED/WHITE
R/B - RED/BLACK
p
w B
p B w
ENGINE CHASSIS
MOUNT BOLT
OFF RIM START
POSITION 1 POSITION 2 POSITION 3
REAR VIEW OF
IGNITION SWITCH

)
ElECTRICAl SYSTEM (Continued)
WIRING DIAGRAM
1660 S/N 0200101
AND LATER
QS, QT & 1900 SERIES
Page 2-5 REV. 12/78
ENGINE
IGNITION COIL
STARTER
SOLENOID
BATTERY
P.T.O. INTERLOCK SWITCH ~
BRAKE INTERLOCK SWITCH
CONNECTOR
REGULATOR/RECTIFIER
AMMETER
CIRCUIT BREAKER- 20 AMP
IGNITION SWITCH
LIGHT SWITCH
HEADLIGHTS
TAILLIGHTS (OPTIONAL)
THROTTLE SOLENOID
COLOR CODE
R- RED
0- ORANGE
B- BLACK
W·WHITE
R/Y- RED/YELLOW
R/W ·RED/WHITE
R/B -RED/BLACK
OFF POSITION RUN POSITION START POSITION
REAR VIEW OF IGNITION SWITCH
START-RUN CIRCUIT
1660 S/N 0100101 AND LATER
RIW
1. CONDENSER
2. IGNITION COIL
3. STARTER
4. SOLENOID
5. BATTERY
6. P.T.O. INTERLOCK SWITCH
7. BRAKE INTERLOCK SWITCH
8. IGNITION SWITCH
9. AMMETER
R/B 10. CIRCUIT BREAKER
COLOR CODE
0- ORANGE
R ·RED
B- BLACK
R/W -RED/WHITE
R/Y -RED/YELLOW
R/B -RED/BLACK

QS, QT & 1900 SERIES
Page 2-6 REV. 12/78
cv---
y y
y
ELECTRICAL SYSTEM (Continued)
CHARGING CIRCUIT
1660 S/N 0100101 THRU 0199999
4
R
LIGHT CIRCUIT
1660 S/N 0100101 THRU 0199999
B
ENGINE
MOUNT
B
CHASSIS
BOLT
1. ENGINE
2. CONNECTOR
3. RECTIFIER/REGULATOR
4. AMMETER
5. CIRCUIT BREAKER
6. SOLENOID
7. BATTERY
8. IGNITION SWITCH
COLOR CODE
Y- YELLOW
R ·RED
R/W • RED/WHITE
RiB • RED/BLACK
B ·BLACK
1. ENGINE
2. CONNECTOR
3. HEADLIGHTS
4. CONNECTOR (NOT USED
ON 1660)
5. HOURMETER (OPTIONAL)
6. TAILLIGHT (OPTIONAL)
7. LIGHT SWITCH
8. IGNITION SWITCH
9. BATTERY
10. SOLENOID
11. CIRCUIT BREAKER
12. AMMETER
13. REGULATOR/RECTIFIER ·
COLOR CODE
Y -YELLOW
A-RED
B -BLACK
W-WHITE
R/W ·RED/WHITE
RiB -RED/BLACK

J
ELECTRICAL SYSTEM (Continued) QS, QT & 1900 SERIES
Page 2-7 REV. 12/78
w
B
B W 4
CHARGING CIRCUIT
1660 S/N 0200101 AND LATER
0
R
9
R/W
LIGHT CIRCUIT
1. RECTIFIER/REGULATOR
2. IGNITION COIL
3. CONDENSOR
4. BATTERY
5. SOLENOID
6. CIRCUIT BREAKER
7. AMMETER
B. IGNITION SWITCH
9. CONNECTOR
COLOR CODE
0- ORANGE
R- RED
B- BLACK
R/W -RED/WHITE
R/B - RED/BLACK
1660 S/N 0200101 AND LATER
R
X~
B
w
R
ENGINE CHASSIS
MOUNT BOLT
1. RECTIFIER/REGULATOR
2. BATTERY
3. HEADLIGHTS
4. CONNECTOR
5. HOUR METER (OPTIONAL)
6. TAILLIGHT (OPTIONAL)
7. LIGHT SWITCH
B. IGNITION SWITCH
9. AMMETER
10. CIRCUIT BREAKER
11. SOLENOID
COLOR CODE
R- RED
B- BLACK
W -WHITE
R/B - RED/BLACK
R/W- RED/WHITE

QS, QT & 1900 SERIES
Page 2-8 REV. 12/78
ElECTRICAL SYSTEM (Continued)
WIRING DIAGRAM
1666 S/N 0100101 THRU 0499999
'
/
1. ENGINE
2. IGNITION COIL
3. STARTER
4. CONNECTOR
5. REGULATOR/RECTIFIER
6. SOLENOID
7. BATTERY
WHITE
ENGINE
MOUNT
8. CIRCUIT BREAKER -20 AMP
9. AMMETER
10. IGNITION SWITCH
11. ATTACHMENT DRIVE SWITCH
12. P.T.O. INDICATOR SWITCH
13. OPTIONAL HOURMETER
14. LIGHT.SWITCH
15. INTERLOCK SWITCH
16. TAILLIGHTS
17. CONNECTOR
18. HEADLIGHTS
19. ATTACHMENT DRIVE
RED
ORANGE
PURPLE
CHASSIS
BOLT
OFF
RED/YELLOW
RED/WHITE
WHITE
DRIVE DRIVE
OFF ON
RUN
REAR VIEW OF
ATTACHMENT
DRIVE SWITCH
REAR VIEW OF IGNITION SWITCH START
)

ELECTRICAL SYSTEM (Continued) QS,
QT & 1900 SERIES
Page 2-9 REV. 12/78
WIRING DIAGRAM
S/N 0500101 THRU 0599999
WHITE
ENGINE MTG.
1. ENGINE
2. IGNITION COIL
3. STARTER
4. CONNECTOR
5. REGULATOR/RECTIFIER
6. SOLENOID
7. BATTERY
8. CIRCUIT BREAKER· 20 AMP
9. AMMETER
10. IGNITION SWITCH
11. ATTACHMENT DRIVE SWITCH
12. P.T.O. INDICATOR LIGHT
13. HOURMETER
14. LIGHT SWITCH
15. INTERLOCK SWITCH
16. TAILLIGHTS
17. CONNECTOR
18. HEADLIGHTS
19. ATTACHMENT DRIVE
RED
BLACK
BLACK
BLACK
CHASISMTG.
RED/YELLOW
RED/WHITE
RED
ORANGE
12
WHITE
DRIVE OFF DRIVE ON
REAR VIEW OF
ATTACHMENT
DRIVE SWITCH
OFF RUN
START
REAR VIEW OF IGNITION SWITCH

QS, QT & 1900 SERIES
Page 2-10 REV. 12/78
ELECTRICAL SYSTEM (Continued)
WIRING DIAGRAM
1666 S/N 0600101 THRU 0700700
\.
/
1. ENGINE
2. ATTACHMENT DRIVE
3. STARTER
4. CONNECTOR
5. HEADLIGHTS
6. SOLENOID
7. BATTERY
RED
8. CIRCUIT BREAKER- 20 AMP
9. AMMETER
10. IGNITION SWITCH
11. ATTACHMENT DRIVE SWITCH
12. P.T.O. INDICATOR SWITCH
13. OPTIONAL HOURMETER
14. LIGHT SWITCH
15. INTERLOCK SWITCH
16. TAILLIGHTS
17. CONNECTOR
RED
BLACK
ENGINE
MOUNT
REAR VIEW OF
ATTACHMENT
DRIVE SWITCH
DRIVE DRIVE
OFF ON
CHASSIS
MOUNT
WHITE
RED/BLACK
ORANGE
RED/
YELLOW
11
ORANGE
ORANGE
PURPLE
REAR VIEW OF IGNITION SWITCH
®®
~)

;
ElECTRICAl SYSTEM (Continued)
OS, QT & 1900 SERIES
TRACTORS
Page 2-11 REV. 4/83
WIRING DIAGRAM
1666 S/N 0700101 AND LATER
1966 S/N 0100101 AND LATER
Model 1666 TO SWI~CH
SfN 0600101 NO. 15 CIRCUIT RED/YELLOW
thru 0999999 BREAKER RED/WHITE
TO TO
STARTER BATTERY fD
- 1'x !6' 8
&2lq_J-' l ITT / RED Loj ~~~~ JRE:!:!_D_-J=():f~---1
(2) l v \!V CJCJ 9
//
q< +<
~ ORANGE
I l
la
11
~ RED T
II RED/BLACK
RED/
PURPLE
__/ r['-_Y:..:oEo:=L=.:LO"-'W"--_.J
f-- ~ORANGE
---
14r---..J
-RED
~
ORANGE
-
ORANGE
PURPLE
L.;tNo ]-
PURPLE I r::J;\
~c
RED
~~L:C
5
1.
2.
3.
4.
5.
6.
'
/
ENGINE
ATTACHMENT DRIVE
STARTER
CONNECTOR
HEADLIGHTS
SOLENOID
BLACK
~
~
P''
ENGINE MTG CHASSIS
MTG
WHITE
q r
ill
REAR VIEW OF
7.
BATTERY
ATTACHMENT
REAR VIEW OF IGNITION SWITCH
8.
CIRCUIT BREAKER- 20 AMP
DRIVE SWITCH
9.
AMMETER
16
~
Q
rf~l~
10.
IGNITION SWITCH
® ®
11.
ATTACHMENT DRIVE SWITCH
12.
P.T.O. INDICATOR LIGHT
Xcv='B))
13.
OPTIONAL HOURMETER
{= =;;
14. LIGHT SWITCH
15. INTERLOCK SWITCH
-
16.
TAILLIGHTS DRIVE DRIVE
17
CONNECTOR OFF ON OFF RUN
START
I