WEBM005300
Shop Manual
SKID-STEER LOADER SERIAL NUMBERS
SK1020-5 37CF00004 and up SK1020-5 turbo 37CTF00003 and up
This material is proprietary to Komatsu America Corp. and is not to be reproduced, used, or disclosed except in accordance with written authorization from Komatsu America Corp.. It is our policy to improve our products whenever it is possible and practical to do so. We reserve the right to make changes or improvements at any time without incurring any obligation to install such changes on products sold previously. Due to this continuous program of research and development, revisions may be made to this publication. It is recommended that customers contact their distributor for information on the latest revision.
Copyright 2003 Komatsu Printed in U.S.A. Komatsu America Corp. October 2003
CONTENTS
CONTENTS Page
10 STRUCTURE AND FUNCTION ........................................................................................ 10-1 20 TESTING AND ADJUSTING............................................................................................. 20-1 30 DISASSEMBLY AND ASSEMBLY .................................................................................. 30-1 40 MAINTENANCE STANDARD ........................................................................................... 40-1
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SAFETY
IMPORTANT SAFETY NOTICE Proper service and repair is extremely important for the safe operation of your machine. The service and repair techniques recommended by Komatsu Utility and describe in this manual are both effective and safe methods of operation. Some of these operations require the use of tools specially designed by Komatsu Utility for the purpose. To prevent injury to workers, the symbols and are used to mark safety precautions in this manual. The cautions accompanying these symbols should always be carefully followed. If any danger arises or may possibly arise, first consider safety, and take necessary steps to face.
GENERAL PRECAUTIONS
SAFETY
Mistakes in operation extremely dangerous. Read all the Operation and Maintenance Manual carefully BEFORE operating the machine. 1. Before carrying out any greasing or repairs, read all the precautions written on the decals which are suck on the machine. 2. When carrying out any operation, always wear safety shoes and helmet. Do not wear loose work clothes, or clothes with buttons missing. Always wear safety glasses when hitting parts with a hammer. Always wear safety glasses when grinding parts with a grinder, etc. 3. If welding repairs are needed, always have a trained, experienced welder carry out the work. When carrying out welding work, always wear welding gloves, apron, glasses, cap and other clothes suited for welding work. 4. When carrying out any operation with two or more workers, always agree on the operating procedure before starting. Always inform your fellow workers before starting any step of the operation. Before starting work, hang UNDER REPAIR signs on the controls in the operator s compartment. 5. Keep all tools in good condition and learn the correct way to use them. 6. Decide a place in the repair workshop to keep tools and removed parts. Always keep the tools and parts in their correct places. Always keep the work area clean and make sure that there is no dirt or oil on the floor. Smoke only in the areas provided for smoking. Never smoke while working.
SK1020-5 SK1020-5 turbo
PREPARATIONS FOR WORK 7. Before adding or making any repairs, park the machine on hard, level ground, and block the wheels to prevent the machine from moving. 8. Before starting work, lower outrigger, bucket or any other work equipment to the ground. If this is not possible, use blocks to prevent the work equipment from falling down. In addition, be sure to lock all the control levers and hang warning sign on them. 9. When disassembling or assembling, support the machine with blocks, jacks or stands before starting work.
10. Remove all mud and oil from the steps or other places used to get on and off the machine. Always use the handrails, ladders or steps when getting on or off the machine. Never jump on or off the machine. If it is impossible to use the handrails, ladders or steps, use a stand to provide safe footing.
PRECAUTIONS DURING WORK 11. When removing the oil filler cap, drain plug or hydraulic pressure measuring plugs, loosen them slowly to prevent the oil from spurting out. Before disconnecting or removing components of the hydraulic circuit and engine cooling circuit, first remove the pressure completely from the circuit. 12. The water and oil in the circuits are not hot when the engine in stopped, so be careful not to get burned. Wait for the oil water to cool before carrying out any work on the cooling water circuits. 13. Before starting work, remove the leads from the battery. Always remove the lead from the negative ( ) terminal first.
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SAFETY
14. When raising heavy components, use a hoist or crane. Check that the wire rope, chains and hooks are free from damage. Always use lifting equipment which has ample capacity. Install the lifting equipment at the correct places. Use a hoist or crane and operate slowly to prevent the component from hitting any other part. Do not work with any part still raised by the hoist or crane.
19. Be sure to assemble all parts again in their original places. Replace any damage parts with new parts. When installing hoses and wires, be sure that they will not be damaged by contact with other parts when the machine is being operated.
15. When removing covers which are under internal pressure or under pressure from a spring, always leave two bolts in position on opposite sides. Slowly release the pressure, then slowly loosen the bolts to remove.
21. When assembling or installing parts, always use specified tightening torques. When installing the parts which vibrate violently or rotate at high speed, be particulary careful to check that they are correctly installed.
16. When removing components, be careful not to break or damage the wiring. Damage wiring may cause electrical fires. 17. When removing piping, stop the fuel or oil from spilling out. If any fuel or oil drips on to the floor, wipe it up immediately. Fuel or oil on the floor can cause you to slip, or can even start fires.
20. When installing high pressure hoses, make sure that they are not twisted. Damaged tubes are dangerous, so be extremely careful when installing tubes for high pressure circuits. Also, check that connecting parts are correctly tightened.
22. When aligning two holes, never insert your fingers or hand. 23. When measuring hydraulic pressure, check that the measuring tool is correctly assembled before taking any measurement. 24. Take sure when removing or installing wheels.
18. As a general rule, do not use gasoline to wash parts. In particular, use only the minimum of gasoline when washing electrical parts.
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FOREWORD
FOREWORD
This shop manual has been prepared as an aid to improve the quality of repairs by giving the operator an accurate understanding of the product and by showing him the correct way to perform repairs and make judgements. Make sure you understand the contents of this manual and use it to full effect at every opportunity. This shop manual mainly contains the necessary technical information for operations performed in a service workshop. The manual is divided into chapters on each main group of components; these chapters are further divided into the following sections. STRUCTURE AND FUNCTION This section explains the structure and function of each component. It serves not only to give an understanding of the structure, but also serves as reference material for troubleshooting. TESTING AND ADJUSTING This sections explains checks to be made before and after performing repairs, as well as adjustments to be made at completion of the checks and repairs. Troubleshooting charts correlating «Problems» to «Causes» are also included in this section. DISASSEMBLY AND ASSEMBLY This section explains the order to be followed when removing, installing, disassembling or assembling each component, as well as precautions to be taken for these operations. MAINTENANCE STANDARD This section gives the judgement standards when inspecting disassembled parts.
NOTE The specifications contained in this shop manual are subject to change at any time and without any notice. Contact your Komatsu Utility distributor for the latest information.
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HOW TO READ THE SHOP MANUAL
HOW TO READ THE SHOP MANUAL VOLUMES
Shop manual are issued as a guide to carry out repairs. These various volumes are designed to avoid duplicating the same information.
DISTRIBUTION AND UPDATING
Any additions, amendments or other changes will be sent to Komatsu Utility distributors. Get the most up-to-date information before you start any work.
SYMBOLS
In order to make the shop manual greatly chelpful, important points about safety and quality are marked with the following symbols. Symbol
Item
Special safety precautions are necessary when performing the work. Safety
FILING METHOD 1. See the page number on the bottom of the page. File the pages in correct order. 2. Following examples show you how to read the page number. Example:
Remarks
Extra special safety precautions are necessary when performing the work because it is under internal pressure.
Caution
Special technical precautions or other precautions for preserving standards are necessary when performing the work.
Weight
Weight of parts or systems. Caution necessary when selecting hoisting wire, or when working posture is important, etc.
Parts that require special attenTightening tion for the tightening torque durtorque ing assembly. 3. Additional pages: additional pages are indicated by a hyphen ( ) and number after the page number. Fle as in the example. Example:
Coat
Parts to be coated with adhesives and lubricants etc.
Places where oil, water or fuel Oil, water must be added, and their quantity. Drain
Places where oil or water must be drained, and quantity to be drained.
REVISED EDITION MARK ( ....)
When a manual is revised, an edition mark is recorded on the bottom outside corner of the pages.
REVISIONS
Revised pages are shown on the LIST OF REVISED PAGES between the title page and SAFETY page.
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HOISTING INSTRUCTIONS
HOISTING INSTRUCTIONS Hooks have maximum strength at the middle portion.
Heavy parts (25 kg or more) must be lifted with a hoist etc. In the Disassembly and Assembly section, every part weighing 25 kg or more is clearly indicated with the symbol
1.
2.
If a part cannot be smoothly removed from the machine by hoisting, the following checks should be made: Check for removal of all bolts fastening the part to the relative parts. Check for any part causing interference with the part to be removed.
3)
Do not sling a heavy load with one rope alone, but sling with two or more ropes symmetrically wound on to the load. Slinging with one rope may cause turning of the load during hoisting, untwisting of the rope, or slipping of the rope from its original winding position on the load, which can cause dangerous accidents.
4)
Do not sling a heavy load with ropes forming a wide hanging angle from the hook. When hoisting a load with two or more ropes, the force subjected to each rope will increase with the hanging angles. The table below shows the variation of allowable load (kg) when hoisting is made with two ropes, each of which is allowed to sling up to 1000 kg vertically, at various handing angles. When two ropes sling a load vertically, up to 2000 kg of total weight can be suspended. This weight becomes 1000 kg when two ropes make a 120° hanging angle. On the other hand, two ropes are subjected to an excessive force as large as 4000 kg if they sling a 2000 kg load at a lifting angle of 150°.
Wire ropes 1)
Use adequate ropes depending on the weight of parts to be hoisted, referring to the table below: WIRE ROPES (Standard «S» or «Z» twist ropes without galvanizing)
Rope diameter (mm)
Allowable load (tons)
10.0
1.0
11.2
1.4
12.5
1.6
14.0
2.2
16.0
2.8
18.0
3.6
20.0
4.4
22.4
5.6
30.0
10.0
40.0
18.0
50.0
28.0
60.0
40.0
The allowable load value is estimated to be onesixth or one-seventh of the breaking strength of the rope used. 2)
Sling wire ropes from the middle portion of the hook. Slinging near the edge of the hook may cause the rope to slip off the hook during hoist g, and a serious accident can result.
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STANDARD TIGHTENING TORQUE
STANDARD TIGHTENING TORQUE The following charts give the standard tightening torques of bolts and nuts. Exceptions are given in section of «Disassembly and Assembly».
1.
STANDARD TIGHTENING TORQUE OF BOLTS AND NUT Width across flat (mm)
Thread diameter of bolts (mm)
Pitch of bolts (mm)
6
1
10
8
1.25
10
kgm
Nm
kgm
Nm
8
0.96 0.1
9.5 1
1.3 0.15
13.5 1.5
13
6
2.3 0.2
23 2
3.2 0.3
32.2 3.5
1.5
17
8
4.6 0.5
45 4.9
6.5 0.6
63 6.5
12
1.75
19
10
7.8 0.8
77 8
11 1
108 11
14
2
22
12
12.5 1
122 13
17.5 2
172 18
16
2
24
14
19.5 2
191 21
27 3
268 29
18
2.5
27
14
27 3
262 28
37 4
366 36
20
2.5
30
17
38 4
372 40
53 6
524 57
22
2.5
32
17
52 6
511 57
73 8
719 80
24
3
36
19
66 7
644 70
92 10
905 98
27
3
41
19
96 10
945 100
135 15
1329 140
30
3.5
46
22
131 14
1287 140
184 20
1810 190
33
3.5
50
24
177 20
1740 200
250 27
2455 270
36
4
55
27
230 25
2250 250
320 35
3150 350
39
4
60
295 33
2900 330
410 45
4050 450
This torque table does not apply to bolts or nuts which have to fasten nylon or other parts non-ferrous metal washer. Nm (newton meter): 1 Nm = 0.102 kgm
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STANDARD TIGHTENING TORQUE
2.
TIGHTENING TORQUE FOR NUTS OF FLARED
Use these torques for nut part of flared. Thread diameter of nut part (mm)
Width across flats of nut part (mm)
TIGHTENING TORQUE kgm
Nm
1/2 - 20
17
2.6 0.5
25.5 4.9
9/16 - 18
17
4 0.5
39.2 4.9
3/4 - 16
22
6.7 2
65.7 19.6
7/8 - 14
27
8 2
78.5 19.6
1.1/16 - 12
32
9.7 3
95.15 29.4
1.5/16 - 12
38
17 3
166.7 29.4
1.5/8 - 12
50
20 5
196.2 49
22
27
8 2
78.5 19.6
33
41
20 5
196.2 49
Sealing surface
Thread diameter of nut part (mm)
Width across flats of nut part (mm)
kgm
Nm
9/16 - 18
17
2.3 2.5
23 25
11/16 - 16
22
3.4 3.9
33 38
13/16 - 16
24
5.2 5.8
51 57
1 - 14
30
8.2 9.2
80 90
1.3/16 - 12
36
12.2 13.3
120 130
1.7/16 - 12
41
15.3 17.3
150 170
1.11/16 - 12
50
18.4 20.4
180 200
2 - 12
57
20.4 24.4
200 240
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TIGHTENING TORQUE
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COATING MATERIALS
COATING MATERIALS The recommended coating materials prescribed in Komatsu Utility Shop Manuals are listed below: Nomenclature
Adhesives
Gasket sealant
Code
Applications
Bostik 99
Used to apply rubber pads, rubber gaskets and cork plugs.
Loctite 406
Used to apply resin, rubber, metallic and non-metallic parts when a fast, strong seal is needed.
Loctite 222
Used for low resistance locking of screws, check nuts and adjustment nuts.
Loctite 242
To prevent the loosening of bolts, nuts and plugs and the leakage of oil. Used for medium resistance locking of screws and nuts of every type, and for locking keys and bearings.
Loctite 262
Used for high resistant of threaded parts that can be removed with normal tools.
Loctite 270
Used for high resistant locking and for sealing threaded parts, bolts and stud bolts.
Loctite 542
Used for sealing the union threads for hydraulic tubes.
Loctite 573
Used for sealing rather exact plane surfaces when the option of possible future dismantling is required.
Loctite 601
Used for high resistant locking of mechanical components that can be removed only after heating
Loctite 675
Used to lock cylindrical couplings and for the permanent locking of threaded parts, and also to lock shafts to bearings, gears, pulleys, pins, bushings, etc.
Loctite 542
Used by itself to seal grease fittings, tapered screw fittings and tapered screw fittings in hydraulic circuits of less than 50 mm in diameter.
Loctite 510
Used by itself on mounting flat surface (Clearance between surfaces within 0.2 mm)
Loctite 518
Used by itself on mounting flat surface (Clearance between surfaces within 0.5 mm
Antifriction compound Litio EP MS2 Applied to bearings and taper shaft to facilitate press-fitting and to prevent (Lubricant including NLGI 2 sticking, burning or rusting. Molybdenum disulfide) Grease (Lithium grease) Vaseline
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Litio EP NLGI 2
Applied to bearings, sliding parts and oil seals for lubrication, rust prevention and facilitation of assembling work. Used for protecting battery electrode terminals from corrosion
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ELECTRIC WIRE CODE
ELECTRIC In the wiring diagrams various colour and symbols are employed to indicate the thickness of wires. This wire code table will help you understand WIRING DIAGRAMS. Example: R N 1.5 indicates a cable having a nominal number 1.5 and red coating with black stripe.
CLASSIFICATION BY THICKNESS Copper wire
Nominal number
Cable O.D. (mm)
Current rating (A)
0.35
1.55
3.5
0.30
0.99
2.80
11
21
0.30
1.48
3.35
14
35
0.30
2.47
3.80
20
4
56
0.30
3.95
4.60
28
6
84
0.30
5.93
5.20
37
Number strands
Ø of strands (mm)
Cross section (mm)
0.5
16
0.20
1
14
1.5 2.5
CLASSIFICATION BY COLOUR AND CODE Primary Code Colour
A
Auxiliary A B
A/B
A G
A N
A/N
Light Blue Light Blue White Light Blue Yellow Light Blue Black
Code
B
Colour
White
Code
C
Colour
Orange
Code
G
Colour
Yellow
Code
H
Colour
Grey
B G
B N
B/N
B R
White Yellow
White Black
White Red
C L
C N
Orange White
Orange Blue
G N
G/N
Orange Black
G/R
Yellow Red
H G
H L
Grey-Yellow
Grey Blue
Grey Black
L G
L N
L
Colour
Blue
Blue White
Blue Yellow
Blue Black
Code
M
M B
M N
M V
Colour
Brown
Code
N
Colour
Black
Code
R
Colour
Red
Red Yellow
Red Black
Code
S
S G
S N
Colour
Pink
Pink Yellow
Pink Black
Code
V
V B
V N
Colour
Green
Code
Z
Colour
Violet
L/G
H N
Code
M/B
L/N
Brown Black
Brown Green
R G
R N
R V
V/B
R/N
L R
L/R
Blue Red
Red Green
Green Black
Z B
Z N
H/R
Grey Red
S/N
Green White Violet White
H R
Brown White
A/V
C/N
Yellow Black
L/B
A V
Light Blue Green
B/R
C B
C/B
A R Light Blue Red
Z/N
Violet Black
COMPOSITION OF THE COLOURS
The coloration of two-colour wires is indicated by the composition of the symbol listed. Example: G V = Yellow-Green with longitudinal colouring G/V = Yellow-Green with transversal colouring
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WEIGHT TABLE
WEIGHT TABLE This weight table is a guide for use when transporting or handling components. Unit: kg Machine model
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Engine assembly - Muffler - Exhaust pipe
235
235
Radiator
35
38
Hydraulic oil tank (without oil)
25
25
Engine hood
18.5
18.5
Cabin (without seat)
215
215
Seat: standard witj suspension
10 16
10 16
Engine-pump group
328 335
328 335
Piston pump: standard High-Flow
91 98
91 98
Wheel, assy. (standard)
52
52
Control valve: 3-spool (standard) 4-spool (High-Flow)
21 24
21 24
Work equipment (without bucket) Arm Work equipment support Bucket Tilt cylinder Dump cylinder
325 80 205 25 15
325 80 205 25 15
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TABLE OF OIL AND COOLANT QUANTITIES
TABLE OF OIL AND COOLANT QUANTITIES RESERVOIR
KIND OF FLUID
AMBIENT TEMPERATURE 30
20
10 0
10
20 30
CAPACITY ( ) 40
50°C
Specified
Refill
10
10
50
32
50
32
13.5
13.5
72
15
SAE 10W SAE 30
Engine oil pan
OIL API CD
SAE 40 SAE 10W-30 SAE 5W-30
Hydraulic system and hydrostatic trasmissione
OIL API CD
SAE 10W SAE 5W-30
Hydraulic circuit with biodegradable oil
Final transmission OIL API CD case (ea.) Fuel tank
SAE 10W-30
DIESEL OIL ASTM D975 N.2
Engine cooling system
PERMANENT COOLANT ASTM D975 N.
IMPORTANT: (1) When the diesel oil sulphur content is less then 0.5%, change the engine oil according to the periodic maintenance intervals indicated in the operation and maintenance manual. In the diesel oil sulphur content exceeds 0.5% change the engine oil according to the following table: Sulphur content from 0.5 to 1.0% over 1.0%
Engine oil change interval 1/2 f regular interval 1/4 f regular interval
(2) When starting the engine at temperatures below 0 °C, use engine oil SAE 10W, 20W-20 and 10W-30, even if during the day the temperature increases by 10 °C. (3) Use engine oil with CD classification; if oil with CD classification is used, reduce the engine oil change interval by a half. (4) Use original products, which have characteristics specifically formulated and approved for the engine, the hydraulic circuit of equipment and for reductions. First filling quantity: total quantity of oil, including the oil for the components and pipes. Oil change quantity: quantity of oil necessary to fill the system or unit during the normal inspection and maintenance operations. ASTM: American Society of Testing and Materials SAE: Society of Automotive Engineers API: American Petroleum Institute
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