Hydraulics - Seafish

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102 SAQ17 (a) The three important values you would check are: • The Viscosity - remember to check the units because sometimes units other than "SUS seconds" are given. As an alternative the SAE number may be used. • The Viscosity Index- usually more than 90. • The Pour Point-this is particularly important if your vessel is to operate in very cold conditions. (b) The operator's manual produced by the makers of the hydraulic system should give you the values you want. If the manual is not on board you could contact the agents or the makers of the system. SAQ18 Volume displaced at A = 0.001 x 0.1 = 0.0001 m3 Movement of B = 0.0001 = 0.002 m 0.05 = 2mm SAQ19 The thing to avoid when adding oil to the system is allowing dirt and other forms of contamination to enter the system. So the precautions should include: • Cleaning the area around the filter plug thoroughly before removing the filter plug. Also clean the top of the oil container. • Use a clean funnel filter with a fine mesh filter screen. • Don't add oil to the system if there is water splashing and repairs being carried out nearby. Remember to use the correct oil and remember to replace the filling plug correctly. <strong>Seafish</strong> Open Learning
103 SAQ20 (a) Viscosity increases as the temperature falls. This makes the oil "thicker" and tends to cause sluggish operation of components. (b) Viscosity decreases as the temperature rises. This makes the oil "thinner" which(reduces the lubrication film between any rubbing surfaces. It may also cause increased leakage past a seal or a spool valve. SAQ21 A reduction in volume flow in a radial pump is obtained by moving the centre lines of the reaction ring and the cylinder block closer together. In the type of pump shown in Figure 48 this would be done by moving the reaction ring to the left, and this would reduce the length of the effective stroke of each piston. SAQ22 Gear pumpf Vane pump, Piston pump SAQ23 You should first have looked in Table 4 on page 85 and you will see that excessive noise from the motor means that it is worn or damaged. If you then look in Table 5 you will see that excessive heat can also indicate a worn or damaged motor. So your answer should be: 'probably a worn or a damaged motor'. <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
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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
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 and 118: 95 Responses to the Self Assessment
Page 119 and 120: 97 SAQ 6 Did you show the change in
Page 121 and 122: 99 SAQ9 The various properties whic
Page 123: 101 SAQ15 SAQ16 A linear actuator p
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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Hydraulics - Seafish

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