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SLOPE MOWER
2011-4
MODEL
SG280E
1
2
We have developed a riding slope mower that improves efficiency
and reduces labor for work on sloped lawns.
This manual describes the structure and functions of the SG280E, as
well as its operation and troubleshooting measures, so that you can
make the most of its capabilities.
Please make the most of the information provided here to enhance
your sales and service activities, and to correctly operate this slope
mower.
Specifications and other details in this manual are subject to change without prior notice.
IHI Shibaura Machinery Corporation
TURF CARE EQUIPMENT DIVISION
April 2011, First Edition
Introduction
3
Contents
Section 1 Overview ·············································································································
3
1-1 Specifications ·············································································································
4
1-2 Overall view [part names] ··························································································· 5
1-3 Maintenance precautions and procedures ································································· 7
Section 2 Engine ················································································································· 9
2-1 Engine specifications ·································································································· 10
2-2 Cross-section diagrams ····························································································· 11
2-3 General precautions for disassembly/assembly ························································ 13
2-4 Disassembling the engine ·························································································· 14
2-5 Disassembling, inspecting, and assembling primary parts ········································ 20
2-6 Assembling the engine ······························································································· 32
2-7 Electric components ··································································································· 40
2-8 Troubleshooting ·········································································································· 43
2-9 Engine standard maintenance chart ·········································································· 44
Section 3 Hydraulic and Power Systems·············································································· 48
3-1 Hydraulic system diagram···························································································· 49
3-2 Functions······················································································································ 50
3-3 Power system··············································································································· 55
Section 4 Electric Components····························································································· 56
4-1 Layout diagram ············································································································ 57
4-2 Safety system, electric components ············································································ 58
Section 5 Disassembling, Assembling, and Adjusting ·························································· 66
5-1 Engine ·························································································································· 67
5-2 Power steering ············································································································· 70
5-3 HST ······························································································································ 73
5-4 Driving motor················································································································ 82
5-5 Hydraulic hoses and pipes··························································································· 94
5-6 Front axle ····················································································································· 98
5-7 Control valves ·············································································································· 103
Section 6 Wiring Diagram ····································································································· 105
6-1 Wiring diagram ············································································································· 106
4
Section 1
Overview
1-1 Specifications
1-2 Overall view [part names]
1-3 Maintenance precautions and
procedures
5
Section 1 Overview
Model
SG280E
Total length (mm)
2495
Total width (mm)
1590
Total height (mm)
1900 (ROPS)/1200 (steering wheel)
Wheelbase (mm)
1500
Front wheels (mm)
1310
Track
tread
Rear wheels (mm)
1310
Dimensions
Minimum ground clearance (mm)
Reference: 140 (with mower deck in lowest position)
Front wheel size
21x11.00-10
Wheels
Rear wheel size
21x11.00-10
Mass (kg)
800
Model
N843
Type
4-cycle water-cooled diesel
Number of cylinders
3
Total stroke volume (cc)
1496
Engine
Rated output kw (HP)/rpm
20.6 (27.6)/2400
Brakes
Dry, internal expansion
Steering
Full hydraulic power steering (with tilt steering)
Transmission
Includes sub-transmission HST
Forward (transmission)
Dual transmission (2WD/4WD)
Num-
ber of
gears
Reverse (transmission)
Dual transmission (2WD/4WD)
Forward (km/h)
L: 0 to 9.0 (4WD) H: 0 to 18.0 (2WD)
Body
Speed
Reverse (km/h)
L: 0 to 6.0 (4WD) H: 0 to 12.0 (2WD)
Fuel tank capacity (liters)
26.0
Battery
55B24L
Engine oil (liters)
3.5
Hydraulic oil (liters)
23.0
Radiator coolant (liters)
4.0
1-1 Specifications
6
Body and operation areas
1-2 Overall view [part names]
Fig.1-2-1
Fig.1-2-2
7
Fig.1-2-3
Total
elapsed
time
Seat swing lever
8
1. Pre-maintenance precautions
1. Wash the mower clean, and then drain oil, fuel, coolant, and other fluids prior to disassembly as
necessary.
2. Keep the maintenance workplace free from dust and brightly lit at all times.
3. Remove all oil and grease from disassembled parts, and then arrange the parts by group on a clean
work stand.
4. Check all work clothes, equipment, and tools to ensure a safe working environment.
2. Basic procedures for pre-maintenance precautions
1. The engine, HST, and hydraulic system are precision equipment. They should be kept clean and
disassembled only when necessary.
2. Parts that have become defective due to wear should be stored temporarily so that they can be
shown to the customer. Model, equipment number, part code number, and part name should be
clearly identified for placing an order.
3. During assembly, it is necessary to oil all movable parts and create an initial oil film for normal
lubrication.
4. Use appropriate tools to tighten bolts and nuts to an appropriate torque, unless specified otherwise.
5. Be sure to turn off the engine before performing inspection, maintenance, or repair work.
Tightening torque chart
* See the bolt head marks on the following page for strength divisions.
Coarse thread
Fine thread
Screw
dimen-
sions
* Strength
division
Screw
pitch
Tightening torque
(kgf⋅m)
Tightening torque
(N⋅m)
Screw
pitch
Tightening torque
(kgf⋅m)
Tightening torque
(N⋅m)
4.8 0.15 to 0.21 1.47 to 2.06
8.8 0.27 to 0.37 2.65 to 3.63
M4
10.9
0.7
0.36 to 0.50 3.53 to 4.90
4.8 0.29 to 0.41 2.84 to 4.02
8.8 0.50 to 0.70 4.90 to 6.86
M5
10.9
0.8
0.68 to 0.96 6.66 to 9.41
4.8 0.50 to 0.70 4.90 to 6.86
8.8 0.85 to 1.15 8.33 to 11.3
M6
10.9
1.0
1.20 to 1.60 11.8 to 15.7
4.8 1.30 to 1.70 12.7 to 16.7 1.55 to 2.05 14.7 to 20.1
8.8 2.30 to 2.90 22.5 to 28.4 2.70 to 3.50 26.5 to 34.3
M8
10.9
1.25
2.90 to 3.70 28.4 to 36.3
1.0
3.10 to 4.10 30.4 to 40.2
4.8 2.60 to 3.40 25.4 to 33.3 2.90 to 3.70 28.4 to 36.3
8.8 4.50 to 5.70 44.1 to 55.9 5.00 to 6.40 49.0 to 62.7
M10
10.9
1.5
5.50 to 7.10 53.9 to 69.6
1.25
5.90 to 7.50 57.8 to 73.5
1-3 Maintenance precautions and procedures
Fig.1-2-4
Parking lever
9
8
Coarse thread
Fine thread
Screw
dimen-
sions
* Strength
division
Screw
pitch
Tightening torque
(kgf⋅m)
Tightening torque
(N⋅m)
Screw
pitch
Tightening torque
(kgf⋅m)
Tightening torque
(N⋅m)
4.8 3.80 to 4.80 37.2 to 47.0 4.40 to 5.60 43.1 to 54.9
8.8 6.70 to 8.50 65.7 to 83.3 7.60 to 9.60 74.5 to 94.1
M12
10.9
1.75
9.40 to 11.8 92.1 to 115.6
1.25
10.10 to 12.90 99.0 to 126.4
4.8 6.40 to 8.20 62.7 to 80.4 7.10 to 8.90 69.6 to 87.2
8.8 10.60 to 13.40 103.9 to 131.3 11.90 to 15.10 116.6 to 150.9
M14
10.9
2.0
14.20 to 17.80 139.2 to 174.4
1.5
15.00 to 19.00 147.0 to 186.2
4.8 8.80 to 11.20 86.2 to 109.8 9.30 to 11.70 91.1 to 114.7
8.8 15.20 to 18.80 149.0 to 184.2 16.00 to 19.60 156.8 to 192.1
M16
10.9
2.0
21.00 to 26.00 205.8 to 254.8
1.5
22.50 to 27.50 220.5 to 269.5
4.8 11.6 to 14.40 113.7 to 141.1 13.40 to 16.60 131.3 to 162.7
8.8 20.00 to 24.00 196.0 to 235.2 23.50 to 28.50 230.3 to 279.3
M18
10.9
2.0
28.00 to 34.00 274.4 to 333.2
1.5
30.50 to 37.50 298.9 to 367.5
4.8 14.70 to 18.30
144.1 to 179.3
17.50 to 21.50 171.5 to 210.7
8.8 24.50 to 29.50
240.1 to 289.1
28.00 to 34.00 274.0 to 333.0
M20
10.9
2.5
37.00 to 45.00
363.0 to 441.0
1.5
40.50 to 49.50 396.9 to 485.1
Conversion chart
kgf⋅
⋅⋅
⋅m →
→→
→ N⋅
⋅⋅
⋅m
.0 .1 .2 .3 .4 .5 .6 .7 .8 .9
0 0.98 1.96 2.94 3.92 4.90 5.88 6.86 7.84 8.82
1 9.8 10.8 11.8 12.7 13.7 14.7 15.7 16.7 17.6 18.6
2 19.6 20.6 21.6 22.5 23.5 24.5 25.5 26.5 27.4 28.4
3 29.4 30.4 31.4 32.3 33.3 34.3 35.3 36.3 37.2 38.2
4 39.2 40.2 41.2 42.1 43.1 44.1 45.1 46.1 47.0 48.0
5 49.0 50.0 51.0 51.9 52.9 53.9 54.9 55.9 56.8 57.8
6 58.8 59.8 60.8 61.7 62.7 63.7 64.7 65.7 66.6 67.6
7 68.6 69.6 70.6 71.5 72.5 73.5 74.5 75.5 76.4 77.4
8 78.4 79.4 80.4 81.3 82.3 83.3 84.3 85.3 86.2 87.2
9 88.2 89.2 90.2 91.1 92.1 93.1 94.1 95.1 96.0 97.0
Conversion example
1kgf⋅
⋅⋅
⋅m = 9.8N⋅
⋅⋅
⋅m 1kgf/cm
2
= 0.098Mps
2.4kgf⋅
⋅⋅
⋅m = 23.5N⋅
⋅⋅
⋅m
.1 .2 .3 .4 .5
1
2
23.5
3
4
Fig.1-3-1
9
Section 2
Engine
2-1 Engine specifications
2-2 Cross-section diagrams
2-3 General precautions for disassembly/assembly
2-4 Disassembling the engine
2-5 Disassembling, inspecting, and assembling
primary parts
2-6 Assembling the engine
2-7 Electric components
2-8 Troubleshooting
2-9 Engine standard maintenance chart
10
Section 2 Engine
N843
Type
Water-cooled 4-cycle stand-alone diesel
Cooling method
Forced-circulation cooling
Cylinder layout
Vertical in-line
Combustion
chamber type
Special excess flow type
Number of cylinders
3
Inner diameter x
stroke
84x90mm
Total stroke volume
1496cc
Compaction ratio
22.2:1
Rated output
20.6kw (27.6HP)/2400rpm
Lubricant quantity
3.5
2-1 Engine specifications
11
Model N843
2-2 Cross-section diagrams
Fig.2-2-1
12
Model N843
Fig.2-2-2
13
1) During an overhaul
Wear in cylinders, pistons, rings, and valves lead directly to the need for an engine overhaul. External indications of
such wear take a variety of forms, making it difficult to make a certain judgment. Therefore, the best method is to
perform inspections and maintenance on a regular basis, record the results, and then make a judgment based on that
data.
External indications of wear and/or damage to cylinders and pistons often include the following, in various combinations:
Reduced compression pressure
Increased consumption of engine oil
Increased consumption of fuel
Poor start up
Reduced output
Increased engine noise
Increased blow-by of explosive gas into the cylinder block, and increased gas from the air breather
Primary indicators for the need of an overhaul include the following:
1. Reduced functioning of battery and starting motor
2. Wear on cylinders, pistons, and piston rings
3. No valve clearance
4. Reduced functioning of injection pump
5. Defective nozzle and valve during injection
2) General precautions during an overhaul
When disassembling the engine, use an engine stand and a work stand for the disassembled parts, and arrange the
parts in order according to the disassembly procedure.
When disassembling the engine, pay careful attention to the assembly marks so that the engine can be assembled
back the way it was. If some parts do not have assembly marks, add marks as necessary.
When disassembling and/or washing the engine, always be careful to check for defects that would not be noticed
after disassembly and/or washing is complete.
During disassembly and assembly, use the correct tools to avoid damaging parts. In addition, be sure to lubricate
movable parts, and use a torque wrench to tighten parts that have a specific tightening torque.
Replace gaskets and packing. Use fluid packing when necessary to prevent leaks.
Use appropriate tools to tighten bolts and nuts to an appropriate torque, unless specified otherwise.
2
-
3
General precautions for disassembly/
assembly
14
1. Removing the nozzle and glow plugs
1) Remove the high-pressure pipes .
* Clean to remove all debris before disassembly.
2) Remove the fuel return pipe .
3) Remove the injection nozzle assembly .
4) Remove the connector , and then remove the glow
plugs.
2. Removing the head cover (intake manifold)
Remove the cap nut and bolts , and then remove the
head cover .
3. Removing the oil pipe
Remove the eye bolt , and then remove the oil pipe .
4. Removing the water pump assembly
1) Remove the bolt , and then remove the fan , holder
, and pulley .
2-4 Disassembling the engine
Fig.2-4-4
Fig.2-4-1
Fig.2-4-2
Fig.2-4-3
15
2) Remove the bypass hose and lower hose from the
water pump .
3) Remove the bolt , and then remove the water pump
and gasket from the engine.
4) Remove the bolt , and then remove the plate and
the gasket from the water pump .
5. Removing the rocker arms and push rods
1) Remove the bolts, and then remove the rocker arm
assembly .
CAUTION: Pay careful attention to the lengths of
the bolts.
2) Pull the push rods out of the cylinders.
CAUTION: Carefully store the caps from the tops of
the valves, to avoid losing them. (See
Fig. 2-4-8.)
6. Removing the exhaust manifold
Remove the nut and bolt , and then remove the
exhaust manifold .
7. Removing the cylinder heads
Equally loosen the bolts two or three times to remove
them, and then remove the cylinder head.
Fig.2-4-8
Fig.2-4-7
Fig.2-4-5
Fig.2-4-6
16
8. Removing the tappet
Pull the tappets up and out of the cylinder block.
9. Removing the injection pump assembly
1) Remove the engine stop solenoid .
2) Remove the bolts and nuts holding the injection
pump .
3) Slowly lift the injection pump over the stud bolts ,
and then pull out the snap pin and remove it from the
link .
CAUTION: Check the number and thickness of
shims inserted on the installation
surface for injection.
Fig.2-4-10
Fig.2-4-11
Fig.2-4-12
Fig.2-4-9
17
10. Removing the crank shaft pulley
1) Remove the lock nut , and then pull out the crank
shaft pulley .
2) Remove the key from the crank shaft .
11. Removing the timing gear case assembly
Remove the bolts , and then remove the timing gear
case .
12. Removing the idle gear and oil pump assembly
1) Remove the E clip , and then remove the oil pump
assembly and idle gear .
<
<<
<<
<<
<Oil pump component parts>
>>
>>
>>
>
No. Name
E clip
Collar
Spring
Shim
Oil pump cover
Rotor
Spring
Idle gear
Thrust washer
Fig.2-4-16
Fig.2-4-13
Fig.2-4-14
Fig.2-4-15
/
