Hydraulics - Seafish

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XI Introduction Welcome to this study module on the hydraulic systems used in fishing vessels. These systems are now an important feature of nearly all fishing vessels. They allow the fisherman to have very fine control overthe machinery used in fishing operations such as power blocks and winches and also allows this control to be from the bridge and other suitable positions. Some fishing methods are not possible without the help of hydraulics and it is important that you understand how these systems work and the attention they may require. This module will help you to achieve this and give you guidance on fault finding and maintenance. PRE-ENTRY REQUIREMENTS Study of this module does not require any previous academic knowledge apart from simple arithmetic. EQUIPMENT REQUIRED The only equipment required is a pencil, paper and two (red and green) crayons or water-based felt tip pens. <strong>Seafish</strong> Open Learning
XIII Objectives After completing this module, you should be able to: 1. Explain the function of hydraulic systems fitted in fishing vessels. 2. Identify the components used in hydraulic systems. 3. Describe the action of hydraulic pumps and motors and explain how they are controlled. 4. Interpret circuit diagrams of hydraulic systems. •/ 5. State the maintenance which is required by hydraulic systems on fishing vessels. 6. Describe procedures for fault-finding on hydraulic systems. <strong>Seafish</strong> Open Learning
Page 1 and 2: SEA FISH INDUSTRY AUTHORITY Hydraul
Page 3 and 4: Hydraulics in Fishing Vessels An Op
Page 5 and 6: SEGMENT FIVE - HYDRAULIC OILS AND F
Page 7 and 8: A Guide for Open Learners This will
Page 9 and 10: VII S.A.Q/S are shown by a box with
Page 11: IX • Time spent just reading a mo
Page 17 and 18: Working cylinder V 7 3 •< ► Loa
Page 19 and 20: Write down a list of the main compo
Page 21 and 22: In this type the rotor shaft is off
Page 23 and 24: 8 Pressure Control Valves Positive
Page 25 and 26: 10 Relief valves are either pre-set
Page 27 and 28: 12 (A) From Pump (P) i a(B) Raise H
Page 29 and 30: 14 Out Out Globe valve Figure 17. S
Page 31 and 32: 16 (?) SAQ25 Explain how a relief v
Page 33 and 34: 18 The cylinders shown in Figures 2
Page 35 and 36: 20 Figure. 31. Figure 32. Port A Po
Page 37: 22 Which types of pumps can be used
Page 41 and 42: 24 Hydraulic Pressure The pressure
Page 43 and 44: 26 In order to help you to compare
Page 45 and 46: 28 ® SAQ18 Using Figure 35 on page
Page 47: 30 ® SAQ29 When a hydraulic motor
Page 51 and 52: 32 Rotor Inlet External Gear Pump F
Page 53 and 54: 34 The vanes are pushed out by cent
Page 55 and 56: 36 Piston Pumps All piston pumps de
Page 57 and 58: 38 Drive shaft flange Piston Yoke c
Page 59 and 60: 40 Eccentric Oil outlet Figure 49.
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43 Segment Four — Hydraulic Syste
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45 K4SS^^ LINES AND LINE FUNCTIONS
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47 PUMP ONE-WAY VARIABLE OUTPUT PUM
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49 • Pilot pressure means that oi
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51 ® A reversible motor with a bra
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53 (?) SAQ15 Using the information
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55 First, identify each of the item
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57 ® SAQ28 Using the diagram of Fi
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59 SUMMARY You have now completed S
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62 PROPERTIES OF HYDRAULIC OILS The
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64 (2) SAQ20 How is the viscosity o
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66 (?) SAQ26 Using Table 3 determin
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68 Additives in Hydraulic Oils Many
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70 CONTAMINATION Dirt and other for
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72 • Metal wear particles • Pac
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74 Full flow filters are all fitted
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77 Segment Six — Maintenance and
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79 Cleanliness has top priority.
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81 Do not 'grip' a hot pipe. Try a
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83 Faulty Seals Faulty Seals on pum
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85 Excessive Noise Table 4 Seafish
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87 Incorrect Flow Table 6 Seafish O
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89 Faulty Operation Table 8 Seafish
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93 So you can see that there are ma
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95 Responses to the Self Assessment
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97 SAQ 6 Did you show the change in
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99 SAQ9 The various properties whic
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101 SAQ15 SAQ16 A linear actuator p
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103 SAQ20 (a) Viscosity increases a
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105 SAQ26 SAE 20W/30 oil will have
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Hydraulics - Seafish

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