Service Manual

F i at
Service Manual
1180, 1180DT, 1280,
1280DT, 1380, 1380DT,
1580, 1580DT, 1880
& 1880DT

THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF

FIAT OR IT’S SUCCESSORS. FIAT AND IT’S SUCCESSORS
ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.

TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS,
AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS.

FI-S-1180
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1180 - 1280 - 1380
1580- 1880·
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WORKSHOP
r,.·-ANUAL FRONT'AXJ.:E.··
- STEERING-...
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"-;
30;
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FRON! WHEEL DRIVE ..•...•...... 40.

HYDRAULIC LIFT UNIT ..••..•....• 50

ELECTRICAL SYSTEM ....•..•..... 60

- SERVICE TOOLS ······-~············· -go

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Z I O N E C Q M M E R ,C I A L E
 1180- 1380 GENERAL: A
1580- 1880 Index
'"L·_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___._ _ _ _ _ _ __
page3

CONTENTS
Page Date Page Date

A- GENERAL 103 · ENGINE: Crankgear

General instructions ................................. 7-8 X-1982 Crankshaft .. .. .. .. .. ... .. .. .. .. .. ... .... .. .. .. .. .. ... .. .. 1-2 X-1982
Safety precautions ................................... 9-10-11 X-1982 Main and big end bearings
1280 - Preliminary information .. .. .. .. .. ... 12 X-1982 and caps .. ... .. .. .. .. .. .. .. ... .. .. ... .. .. .. .. .. ... .. 2-3 X-1982
Pistons and rings .. .. .. .. ... .. .. .. .. .. .. .. .... .... ... . 3-4 X-1982
Connecting rods .. .. .. .. .. ... .. ...... .. .. .. .. .. .. .. .. .. 5 X-1982
00 • SPECIFICATION Flywheel .................................................. 5 X-1982
Identification datg - Weights .. ... .. .. .. .... ... .. 1-2-3 X-1982
11 80 H and 11 80 DTH ... .. .. .. .. .. ... .. ... .. .. .. .. 4 X-1982
Engine ..... ... ...... .......... .............. .. ..... .... ... . 5-6-7 X-1982
Power Train schematics 104 • ENGINE: Fuel system
........................... 8-9-10-11-12-13-14-15-16 X-1982 Precleaner and air cleaner - Fuel tank .. .. . 1 X-1982

' Power Train - Brakes - Steering - Front

axle.....................................................
Front wheel drive - Rear wheels - Power
17 X-1982
Fuel filters ................ .................... ............
Turbocharger: Description and operation
- General - Removal and replacement 3-4-5
1-2 X-1982

X-1982
Take -off ............................................. 18 X-1982 Garrett turbocharger overhaul (1380) ...... 6-7-8-9 X-1982
Lift - Towing attachments ...... .............. ..... 18-19 X-1982 Holset turbocharger overhaul (1880) 9-10-11-12 X-1982
Ballasting - Body - Electrical system .. .. .. .. 19-20 X-1982 Turbocharger trouble shooting ........ ......... 12 X-1982
Lighting - Instruments and Fuel system diagrams......... 13-14-15-16-17-18 X-1982
accessories - Tyre sizes ..................... 20-21 X-1982 Injection pump .. .... ... .. .. .. .. ... .. .... .. ..... .... .. .. 19 X-1982
Main dimensions .. .... .. .. .. .. .. .. .. .. .. .... ..... .. .. . 22-23 X-1982 Internal pump timing - BOSCH distributor
Capacities .. .... .. .. ... .. .. .. .. .. .. .. .. .. .. .... .. .... .. .. . 24 X-1982 pump (1180) ....................................... 19 X-1982
Internal timing - C.A.V. distributor pump
(1180 and 1280) .............. ................... 20-21 X-1982
10 - ENGINE: Specification and data Injection pump installation and external ti-
Engine block - Cylinder head .. .. .. ... .. .. .. .. .. 1-2 X-1982 ming - BOSCH and C.A.V. .................. 21 X-1982
Crank gear ............................................... 2-3-4-5 X-1982 Injection pump test and calibration - FIAT
Valve gear ............................................... 5-6-7-8 X-1982 in-line pump (1380 and 1580) ............. 22 X-1982
Lubrication system ... .. .. .. .. .. .. .. ... .. .. .. ... .. .... 9 X-1982 Governor damper end float check .. .... .. ... 22 X-1982
Cooling system .. .. .. .... .. .. .. .. .... ... .. .. .. .. ... .. .. 1O X-1982 Camshaft bearing adjustment ...... ............ 23 X-1982
Fuel system ........... 10-11-12-13-14-15-16-17-18 X-1982 Injection pump and governor calibration
Torque data ............................. ............ .... 19 X-1982 and testing .. .. .. .. .. .. .. .. .... .. .. .. .. .. .. 23-24-25-26 X-1982
Engine section mod. 1180 .............. .... ..... 21 X-1982 External pump timing .... ...... ..................... 26 X-1982
( Engine section mod. 1380 ...... .. .......... ..... 22 X-1982 Sections through FIAT in-line injection
Engine section mod. 1580 ........ ............... 23 X-1982 pump (1380 and 1580) ....................... 27 X-1982
Engine section mod. 1880 ............. .......... 24 X-1982 Sectionr through speed governor for
BOSCH in°line pump (1880) ............... 28 X-1982
Sections through BOSCH in-line injection
100 - ENGINE: Description - Performance data pump ( 1880) .... .. .... ......... .. ... ........ .... ... 28 X-1982
Description .. .. .. .. .. .. .. .. .. .. .... .. .. .. .. .. .. .. .. .. ... .. 1 X-1982 BOSCH injection pump and governor
Engine performance data ... .. ... .. ... .. .. .. ... .. 1-2-3 X-1982 (1880) ................................................. 29 X-1982
Turbocharged engine performance test 3 X-1982 - Overhaul.......... 29-30-31-32-33-34-35-36-37 X-1982
Compression test .. .. .. .... .. ... .. .. .. .. .. .. .. .. .. .. .. 3-4 X-1982 Injection pump and governor adjustment 37-38 X-1982
To remove - installation .. .............. ........... 4-5 X-1982 Pump Timing .. ...... .. .. .. ... ........ ... ..... ... .... .. . 38 X-1982
Aneroid (1880) ............... ............... ........... 39 X-1982

101 - ENGINE: Crankcase

Cylinder liners .. .. .. .. .. .. .. .. .. ... .. .. .. .. .. .. .. ... ... . 1-2-3 X-1982
Cylinder head .. .. .. .. .. .. .. .. .. .. .. ... .. .. .. .. .. .. .. ... 3-4-5 X-1982 105 - ENGINE: Lubrication system
Oil sump .................................................. 5 X-1982 Lubrication system diagram (1180) ........ .. 1 X-1982
Lubrication system diagram (1380) ......... . 2 X-1982
Lubrication system diagram (1580) ........ .. 3 X-1982
102 - ENGINE: Valve gear Lubrication system diagram (1880) ......... . 4 X-1982
Camshaft - Valves, guides and springs 1-2 X-1982 Oil pump - Oil filter .................................. . 5-6 X-1982
Tappets, pushrods and rockers ..... .......... 2-3-4 X-1982 Heat exchanger - Low oil pressure indica-
Valve gear train .................... .......... ......... 4 X-1982 ting system ....................................... .. 6 X-1982
 A GENERAL:
Index
page4

Page Date Page Date

106 • ENGINE: Cooling system 203 • POWER TRAIN: Crawler gear

Cooling system diagram (1180 and 1380) 1 X-1982 Description - Overhaul ...... ..... ... .. ... .... .. .... 1-2 X-1982
Cooling system diagram (1580 and 1880) 2 X-1982 Mechanical reverser: Description - Over-
Description - Water pump . ... .. .. .. ..... ...... ... 3-4 X-1982 haul..................................................... 2-3 X-1982
Radiator .... .... ....... .. ... ....... .... ..... .. ... ... ....... 4-5 X-1982
Belt tension adjustment - Water tempera-
ture gauge - Thermostat .. ..... ..... ....... .. 5 X-1982 204- POWER TRAIN: Bevel drive and differential
Rear transmission removal ...................... 1-2 X-1982
Removal and installation of bevel drive
. 20 • POWER TRAIN: Specification and data and differential (mechanical differential
lock version) ....................................... 2 X-1982
Clutch ...................................................... 1-2 X-1982
Removal and installation of bevel drive
Transmission and splitter .. ... .. ... ... .. ....... ... 3-4-5 X-1982
and differential (hydraulic differential
Crawler gear ..... .. . ........ ... .... .... .. ..... .. ... ..... 5 X-1982
lock version) ....................................... 2-3-4-5 X-1982
Reverser .................................................. 5 X-1982
Bevel pinion shaft removal and installa-
Rear bevel drive and differential .. .... .. .... .. 6-7 X-1982
tion...................................................... 5-6 X-1982
Hydraulic differential lock ......................... 7-8-9 X-1982
Bevel drive adjustment
Brakes ..................................................... 10-11 X-1982 (
............................. 7-8-9-12-13-14-15-16-17 X-1982
Final drives .... .. .. .. .... .... .. .. ..... ........ .... .. ..... 11 X-1982
Longitudinal and cross sections through
Power take off ................................ 11-12-13-14 X-1982
bevel drive and differential ................. . 10-11 X-1982
Torque data ............................................. 15-16 X-1982
Mechanical differential lock assembly and
.Longitudinal section through power train
adjustment ......................................... . 17 X-1982
(1180) ................................................. 17 X-1982
Hydraulic differential lock - Removal and
Longitudinal section through power train
installation .......................................... . 18 X-1982
(1180 H - 1380 - 1580) ....................... 18 X-1982
Hydraulic differential lock - Circuit press-
Longitudinal parts section through power
ure test ............................................... . 19 X-1982
train (1880) ......................................... 19 X-1982
Early differential lock engagement .......... . 20 X-1982
Cross section through power train (1880) 20 X-1982
Early differential lock disengagement ..... . 21 X-1982
Cross section through power train (1380 -
X-1982 Late differential lock engagement .......... .. 22-23 X-1982
1580) .................................................. 21
Late differential lock disengagement ...... . 23-24 X-1982
Cross section through power train (1880) 22 X-1982

205 • POWER TRAIN: Brakes

200 • POWER TRAIN: Removal and installation Hydraulic system operation ................... .. 1-2 X-1982
Platform removal and installation .... .. .... .. . 1 X-1982 Brake unit assembly and disassembly .... . 2 X-1982
Platform removal together with the cab .. . 1-2 X-1982 Master cylinder assembly and disassem-
Fiat cab removal and replacement bly ...................................................... . 3-4 X-1982
without platform .. .. .... .. .. ... . .. .. .. .... .. .. .. .. 2 X-1982 Brake pedal adjustment .......................... . 4 X-1982
Brake pedal installation .......................... .. 5 X-1982
Brake system bleeding ........................... . 5 X-1982
Master cylinder bench test ..................... .. 6-7 X-1982
201 • POWER TRAIN: Clutch
Parking brake ......................................... . 8 X-1982
Ferodo or Luk clutch removal and in- X-1982
Parking brake lever adjustment ............. .. 8
stallation ... .. ... . .... .............. ..... ..... .. .... .. 1-2 X-1982
Ferodo 12"/12" clutch overhaul (1180) ..... 2-3-4 X-1982
Ferodo 12"/12" clutch adjustment (1180) 4-5 X-1982 206 • POWER TRAIN: Final drives
Luk 12"/12" clutch overhaul (1180) .......... 6-7-8 X-1982
Removal ................................................. . 1-2 X-1982
Luk 12"/12" clutch adjustment (1180) ...... 8-9 X-1982
Assembly ................................................ . 2-3 X-1982
Early model master clutch linkage adjust-
Final drive units with twin wheels ............ . 4 X-1982
ment (1180, 1380, 1580 and 1880) .. .. 1O X-1982
PTO clutch linkage adjustment (1180) ..... 10-11 X-1982
Master clutch hydraulic control .. .............. 12 X-1982
207 • POWER TRAIN: Power take off
Removal and installation .. .. .. .. ... ..... .... .... .. 1 X-1982
Disassembly and assembly .. .. ... .......... ... . 1-2 X-1982
202 • POWER TRAIN: Transmission Longitudinal section through PTO .. ... .. .. .. 2 X-1982
Transmission removal and installation ... .. 1-2 X-1982 PTO hydraulic clutch removal and in-
Disassembly ............................................ 2-3-4-6 X-1982 stallation .... ...... .... .......... ...... .. ....... .... 3-4-5-6 X-1982
Longitudinal and cross sections through PTO hydraulic clutch pressure relief valve
transmission and splitter .. .. .. ...... . .. ..... . 5 X-1982 setting check ....................................... 7-8 X-1982
Inspection - Assembly .......................... 7-8-9-10 X-1982 Hydraulic pump - Overhaul ...................... 8-9 X-1982 (
Transmission adjustments .. . 11-12-13-14-15-16 X-1982 PTO hydraulic operation .. ...... ... .. ..... ... ... .. 10-11 X-1982
 1180- 1380 GENERAL: A
1580- 1880 Index
page5
)

Page Date Page Date

30 • FRONT AXLE· STEERING: Specification and data 501 • HYDRAULIC LIFT UNIT: Lift
Front axle.................................................
Power steering .........................................
1
1-2
I X-1982
X-1982
Description ............. ......... ...... .... .... .. .... .....
Removal - Disassembly ...........................
1-2
2-3
X-1982
X-1982
Torque data ............................................. 3 X-1982 Inspection ................................................ 4 X-1982
Assembly ................................................. 4-5-6 X-1982
Hydraulic lift system diagrams ..... .. ... ....... 7 X-1982
301 • FRONT AXLE· STEERING: Front axle Lift control linkage schematics - Opera-
Removal and installation - Steering tion...................................................... 8 X-1982
knuckle overhaul ................................. 1-2 X-1982 Sensitivity relay link adjustment ... ........ .... 9 X-1982
Axle check .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 2 X-1982 Control valve sensitivity adjustment ......... 9-10 X-1982
Start of lift adjustment in position control
...................................................... 10-11-12 X-1982
302 • FRONT AXLE· STEERING: Power steering Start of raise adjustment in draught con-
Power steering overhaul .. .. .. .. .. .. .. .. .. .. .. .. .. 1-2 X-1982 trol ...................................................... 12 X-1982
Hydraulic cylinder overhaul .... .......... ..... .. . 2 X-1982 Maximum lift arm travel adjustment .. ....... 13 X-1982
Rotary valve check .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... . 3 X-1982 Control lever actuating force adjustment 13 X-1982
Return check ................. ....... ................... 3 X-1982 Valve checks .. .. ......... ........ ........... .... ....... 14 X-1982
'\ Seal check .. .. .. .. .. .. .. .. .. ... .. .. .. .. .. .. .. .. .. .. ... .. . 3 X-1982
Pressure relief valve setting .. .. .. ............... 4 X-1982
Cylinder safety valve setting .. .. ..... ........... 4-5 X-1982
Steering control valve overhaul ........ ....... 5-6 X-1982 502 • HYDRAULIC LIFT UNIT: Lift pump
Operation - Diagrams.............................. 6-7 X-1982 Overhaul .. ................ ...... ... .... .. .. .. .... ......... 1-2 X-1982
Fault finding chart .. .......................... ........ 8-9 X-1982 Output test .. .. .. .. .. .. .. .. .. .. .. .. ... .. .. ... .. .. .. .. . .. .. 3 X-1982
Hydraulic pump overhaul ... ................ 10-11-12 X-1982
Output test .. .. ... .. .. .. .. .. ... .. ... .. .. .. .. .. .. .. .. .. .. .. 12 X-1982

503 • HYDRAULIC LIFT UNIT: Implement attachment

40 • FRONT WHEEL DRIVE: Specification and data
Three point linkage - Right-hand lifting
Frontaxle ................................................. 1-2-31
Axle drive - Drive shafts ........................... 3
X-1982
X-1982
rod ..................................................... .
Draught control device ............................ .
1
2
X-1982
X-1982
I
Torque data............................................. 4 X-1982

401 • FRONT WHEEL DRIVE: Front axle

Removal - Final drive, wheel hub and 504 • HYDRAULIC LIFT UNIT: Remote control valves
steering knuckle overhaul .. .. ..... .......... 1-2 X-1982 Description and operation .. ........... ........... 1-2 X-1982
King pin bearing adjustment .. ............ ...... 2-3 X-1982 Cylinder and remote control valve opera-
Wheel bearing adjustment .. .. .. ... .. .. .......... 3-4 X-1982 tion schematics ................................... 1-2-3-4 X-1982
Bevel drive and differential overhaul .. ...... 4-5 X-1982 Disassembly ....... ........ ................ ............. 5 X-1982
~ Bevel drive and differential adjustment On-bench relief valve adjustment .. .. .... .... 6 X-1982
X-1982 Spool return test .......... ............. ............... 7 X-1982
················································· 5-6-7-8-9-10
Front axle hydraulic lock clutch overhaul Remote control valve leakage test .. .. ... .. .. 8 X-1982
...................................................... 10-11-12 X-1982 Trailer brake remote control valve .. .... .... . 9 X-1982
- Hydraulic system diagrams ................. 9-10-11 X-1982

402 • FRONT WHEEL DRIVE: Drive shafts • Axle drive

Drive shafts removal and installation -
Axle drive removal and disassembly
Axle drive assembly ................................ .
1
2
X-1982
X-1982
I 60 • ELECTRICAL SYSTEM: Specification
Charging system ........... ............... ............
and data
1 X-1982
Front wheel drive sections ...................... . 3 X-1982 MARELLI starter ...................................... 2-3 X--1982
BOSCH starter......................................... 4-5 X-1982
50 • HYDRAULIC LIFT UNIT: Specification and data Battery - Fuses ... .. .. .. .. .. .. .. .. .. .. .. .. ... ... .. ... .. 6 X-1982
Lighting signals - Accessories ................. 7 X-1982
Lift ···························································· 1-2-3 X-1982 Starter switch - Lighting switch - Tractor
Lift pump ................................................. . 3-4 X-1982 and trailer turn signal switch ............. .. 8 X-1982
Implement attachment ........................... .. 5-6 X-1982
Controls and instruments ....................... .. 9 X-1982
Auxiliary cylinder ..................................... . 6 X-1982
Wiring diagram ....................................... . 10 X-1982
Remote control valves ............................ . 7 X-1982
Torque data ............................................ . _8 X-1982
Trouble shooting chart ............................ . 9-10 X-1982
(
}i. Trailer brake control valve trouble shoot-
ing chart ............................................. . 10 X-1982 90 • SERVICE TOOLS .................... 1-2-3-4-5-6 I X-1982
 1180- 1380 00
1580- 1880 SPECIFICATION
page 1

IDENTIFICATION DATA
Marketing code:
- 2-wheel drive .... .. .... .................. . ... .. ...... .... 1180 1380 1580 1880
- 4-wheel drive ..................... ....... ........ ... ..... 1180 DT 1380 DT 1580 DT 1880 DT
Engineering code:
- 12-speed, 2-wheel drive .. .......... ..... ...... .. .. 658.100.000 659.100.000 660.200.000 660.100.000
- 12-speed, 2-wheel drive
with reverser ............................................. 658.100.000 659.100.000 660.200.000 660.100.000
var. 720.11 O var. 720.110 var. 720.110 var. 720.110
- 12-speed, 2-wheel drive with
high speed bevel drive ....... ... ... ......... ....... 658.100.000 659.100.000
var. 720.320 var. 720.320
- 24-speed, 2-wheel drive ........... ........... ..... 658.100.000 659.100.000 660.200.000 660.100.000
var. 720.111 var. 720.111 , var. 720.111 var. 720.111
- 24-speed, 2-wheel drive with
high speed bevel drive ............. ......... .... ... 658.100.000 659.100.000
var. 720.111 var. 720.111
+ var. 720.320 + var. 720.320

j
 104 ENGINE:
Fuel system
page2

C
Venting fuel circuit.
a.1180 • b.1380 - c. 1580 • d.1880 -1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11. See text.

- 1580 and 1880, back off screw (3, figs. c and d) is free from air bubbles. Tighten plug (3), repeat the
and replace cartridge inside container (4). above sequence on plug (6) and actuate lever (8) a
few more times;
Every 800 hours:
- 1180, back off screw (6, fig. a) and replace car- - 1380, 1580 and 1880, back off screws (3, fig. b,
tridge (7); 1380) or screw (11, figs. c and d, 1580 and 1880)
- 1580 and 1880, unscrew filter (5, figs. c and d) and priming knob (9) through two turns, and pump
from support and replace. until the fuel issuing from orifice in screws (3 or 11 )
is free from air bubbles. Tighten screws (3 or 11 )
Following filter maintenance, bleed the fuel circuit as and back off connection (10) through two turns and
follows: actuate knob (9) until the fuel issuing from the con-
- 1180, back off plug (3, fig. a) through two turns and nection is free from air bubbles. Retighten the con-
actuate lever (8) until the fuel issuing from the plug nection and pump priming knob (9) ten more times.
 1180- 1380 POWER TRAIN: 201
1580- 1880 Clutch
page5

Checking and adjusting PTO clutch release lever alignment on the bench using tool 291291/2 (fig. a) or universal tool 293650 (fig. b).
B. Spacer - C. Register - D. Nut - L. Knob - M. Wrench from set 293763 - V, = .1 mm (.004 in) for universal tool 293650 or 1.2 mm (.06 in) for
tool 291291/2, Clearance to be obtained between release lever ends (1) and register (C) - 1. Release levers - 2 and 3. Adjusting screw and lock
nut.

cy being due to varying PTO driven plate thickness

Note - On-bench and on-flywheel clutch adjustment
owing to machining tolerance build-up or wear, plus
may result in quite considerable differences in terms of
the magnification inherent in the high leverage ratio.
positioning, a fact which does not affect clutch efficien-

Parts of tool 291291/2 for LUK 12"/12" clutch adjustment (1180). Parts of universal tool 293650 for LUK 12"/12" clutch adjustment
A. Base plate 292598 - B. Spacer 50.001 (to be constructed with (1180).
reference to diagram on page 3) - C. Register 292939/1 - D. Nut A. Base plate 293332/2 - B. Spacer 293741 - C. Register 293731 -
292344 - E. Locators 293733 - F. Fasteners 291292/1 - G. Fastener D. Spacer locknut 293730 - E. Locators 293726 - F. Fasteners
guide bushings 291293/1. 293725 - G. Fastener guide bushings 293734. - I. Pads 293755 - L.
Register knob 293739. - M. Locator knobs 293740. - N. Fastener
spaces 292345.
 1180- 1380 POWER TRAIN: 207
1580-1880 Power take off
page5

PTO hydraulic clutch.

1. Locking wire - 2, 8, 9 and 12. Retaining
rings - 3. Driven hub - 4. Clutch housing - 5.
Drive hub - 6. Needle roller bearings - 7. Spac-
ers - 10. Clutch support - 11. Clutch plate
spring - 13. Capscrew - 14. Pressure relief
valve - 15 and 17. Roll pins - 16. Clutch plate
lube pressure limiting valve - 18. Control valve
spool detent ball - 19. Control valve spool.

On late model tractors back off screw (42, page 4), to - remove drive hub, driven and drive plates, two nee-
remove filter cartridge or back off nut (43) to remove dle roller bearings (6) and spacers (7);
filter with associated lower line (41 ).
- remove retaining rings (8 and 9) and withdraw
clutch housing from support (1 O);
Disassemble clutch as follows:

- withdraw locking wire (1) using suitable pliers;

Note: Make a tool as shown on page 6 for spring (11)
- push retaining ring (2) inward using a screwdriver removal.
and insert a steel strip between driven hub (3) and
the clutch housing (4) as shown;
- install tool (1) on clutch housing as shown on page
- push out driven hub (3) using a driver applied to 6. Tighten nut to slightly compress spri~ and re-
internal spline end; move retaining ring (12);

Removing (installing) PTO clutch pump drive gear.

1. Pin securing clutch support to transmission housing - 31. Retain- Removing PTO clutch drlven,,hub.
ing ring - 35. Drive gear. 1. Steel strip - 3. Driven hub.

i
L ___
 1180- 1380 FRONT AXLE - STEERING: 302
1580- 1880 Power steering
page 1
-·

POWER STEERING OVERHAUL wise leakage will result necessitating renewal of the
entire power steering unit.
Hydrostatic steering system components and their op- During r-emoyal and installation of s ~ (6) and r.Qlfily
eration are illustrated in the diagram of page 7, section valv..e (5), gin (1) should be kept horizontal to prevent it
302. from becoming unseated and falling into the grooves
inside the steering unit, which will impede withdrawal
of the assembly.
Removal
Remove the unit from the tractor as follows:
- remove the screws (C 1 ) retaining the cover to body
(3) and withdraw the cover, cam ring (8) with
- remove front and rear side panels, exhaust
attached rotor (9), thrust washer (10), spacer (12),
silencer, hood and air cleaner with associated sup-
rotor shaft (7), sleeve (6) with attached rotary valve
port;
(5), pin (1) and cup (28), followed by thrust bearing
) - drain oil from power steering tank, then disconnect (29) in that order;
battery negative terminal and the four power steer-
- overturn the steeriog unit and retrieve non-return
ing hoses;
valve ball (4),, after 'removing the threaded stop.
- remove steering wheel and transmission and split-
ter control levers. Disconnect the instrument panel
and tip backward toward seat; Assembly
- remove control board, back off the four capscrews
Reverse the disassembly sequence noting the follow-
securing steering column to power steering unit
ing points:
and retrieve the unit from the engine side.
- always replace the seals;
Disassembly - insert seal (31, page 7, section 302) between body
and rotary valve (5) using tool 293388:
Disassemble the steering unit as follows:
- if spring (2) is to be replaced, use tool 293389;

Note: Do not strike sheet metal cap (30, page 7, sec-

} tion 302) on rotary valve for any reason, other-

11067

_) Disconnecting (connecting) power steering hoses. Removing (installing) steering column from power steering~..
body. ·-