Hydraulics - Seafish

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96 SAQ4 There are quite a numberof things you can list in this answer, but you should first have looked for 'slow movement in Table 8 on page 89. It gives you four possible causes: • Oil viscosity too high • Insufficient lubrication • Sticking servo valve • Worn component But it also tells you to look under 'low;flow' on page 87 where you are given another eight possible causes, one of which, namely, 'worn component', has already been listed. So, there are eleven possible causes which you should have listed. SAQ5 The 3 main sources of contamination are: (a) (b) (c) Contaminants in the replacement oil. From the atmosphere through seals and from the surfaces of cylinder rods, and through the breather on the tank. From the wearing of components in the system. <strong>Seafish</strong> Open Learning
97 SAQ 6 Did you show the change in position of the 'arrow' in the relief valve (D ? Also the SAQ indicated that both the return line filters were choked. You should have shown oil flowing through the bypass loop on each filter. SAQ 7 If no indicator is fitted there should be pressure gauges in the line. There will be a large pressure difference between the gauge on the inlet line and the gauge on the outlet line. As the filter blocks the flow through the element is restricted and the pressure before the filter builds up and the pressure after the filter will be lower than normal. <strong>Seafish</strong> Open Learning
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SEA FISH INDUSTRY AUTHORITY Hydraul
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Hydraulics in Fishing Vessels An Op
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SEGMENT FIVE - HYDRAULIC OILS AND F
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A Guide for Open Learners This will
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VII S.A.Q/S are shown by a box with
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IX • Time spent just reading a mo
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XIII Objectives After completing th
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Working cylinder V 7 3 •< ► Loa
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Write down a list of the main compo
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In this type the rotor shaft is off
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8 Pressure Control Valves Positive
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10 Relief valves are either pre-set
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12 (A) From Pump (P) i a(B) Raise H
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14 Out Out Globe valve Figure 17. S
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16 (?) SAQ25 Explain how a relief v
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18 The cylinders shown in Figures 2
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20 Figure. 31. Figure 32. Port A Po
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22 Which types of pumps can be used
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24 Hydraulic Pressure The pressure
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26 In order to help you to compare
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28 ® SAQ18 Using Figure 35 on page
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30 ® SAQ29 When a hydraulic motor
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32 Rotor Inlet External Gear Pump F
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34 The vanes are pushed out by cent
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36 Piston Pumps All piston pumps de
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38 Drive shaft flange Piston Yoke c
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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
Page 67 and 68: 47 PUMP ONE-WAY VARIABLE OUTPUT PUM
Page 69 and 70: 49 • Pilot pressure means that oi
Page 71 and 72: 51 ® A reversible motor with a bra
Page 73 and 74: 53 (?) SAQ15 Using the information
Page 75 and 76: 55 First, identify each of the item
Page 77 and 78: 57 ® SAQ28 Using the diagram of Fi
Page 79: 59 SUMMARY You have now completed S
Page 83 and 84: 62 PROPERTIES OF HYDRAULIC OILS The
Page 85 and 86: 64 (2) SAQ20 How is the viscosity o
Page 87 and 88: 66 (?) SAQ26 Using Table 3 determin
Page 89 and 90: 68 Additives in Hydraulic Oils Many
Page 91 and 92: 70 CONTAMINATION Dirt and other for
Page 93 and 94: 72 • Metal wear particles • Pac
Page 95 and 96: 74 Full flow filters are all fitted
Page 99 and 100: 77 Segment Six — Maintenance and
Page 101 and 102: 79 Cleanliness has top priority.
Page 103 and 104: 81 Do not 'grip' a hot pipe. Try a
Page 105 and 106: 83 Faulty Seals Faulty Seals on pum
Page 107 and 108: 85 Excessive Noise Table 4 Seafish
Page 109 and 110: 87 Incorrect Flow Table 6 Seafish O
Page 111 and 112: 89 Faulty Operation Table 8 Seafish
Page 113 and 114: 93 So you can see that there are ma
Page 117: 95 Responses to the Self Assessment
Page 121 and 122: 99 SAQ9 The various properties whic
Page 123 and 124: 101 SAQ15 SAQ16 A linear actuator p
Page 125 and 126: 103 SAQ20 (a) Viscosity increases a
Page 127 and 128: 105 SAQ26 SAE 20W/30 oil will have
Page 129 and 130: Other modules in this series which
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