Download presentation
Presentation is loading. Please wait.
1
by Rod Erickson, Eaton Corp. Hydraulics Training Center
伊顿转向系统 常见故障分析 Draft Prepared by Rod Erickson, Eaton Corp. Hydraulics Training Center
2
转向系统常见故障分析 如何分析一个故障系统? – 参考手册 # 7-207 ?
3
转向器的组成部分 转向器组成元件
4
问题 1 - 转向迟缓，转向困难或者失去转向功能 4. 如果是负荷传感系统，确保负荷传感回路畅通或者管径太小. 也不能忽视优先阀的检查
4. 如果是负荷传感系统，确保负荷传感回路畅通或者管径太小. 也不能忽视优先阀的检查 3. 油管连接错误 Engine PFC Pump Reservoir Filter L T R P EF CF p LS 2. 安全阀失效 1. 检查泵的磨损和故障
5
问题 2 --偏离 车辆不能沿直线行走.
6
问题 2 --偏离
7
问题 2 --偏离
8
问题 2 --偏离
9
问题 2 --偏离
10
问题 2 --偏离
11
问题 2 --偏离
12
问题 2 --偏离
13
问题 2 --偏离
14
问题 2 --偏离
15
问题 2 --偏离
16
问题 2 --偏离
17
问题 2 --偏离
18
问题 2 --偏离
19
问题 2 --偏离
20
问题 2 --偏离
21
问题 2 --偏离
22
问题 2 --偏离
23
问题 2 --偏离
24
问题 2 --偏离
25
问题 2 --偏离
26
问题 2 --偏离
27
问题 2 --偏离
28
问题 2 --偏离
29
问题 2 --偏离
30
问题 2 --偏离
31
问题 2 --偏离
32
问题 2 --偏离
33
问题 2 --偏离
34
问题 2 --偏离
35
也辆不能沿直线行走. 问题出在哪里呢? 问题 2 --偏离 1. 检查气穴,
1. 检查气穴, Look for a restriction between the inlet and pump Check for clogged suction strainer or clogged inlet filter
36
CAVITATION
37
CAVITATION
38
CAVITATION DAMAGE
39
Vehicle will not stay in a straight line.
PROBLEM 2: WANDER Vehicle will not stay in a straight line. 1. Check for Cavitation 2. Air in the system, Leaky Fitting.
40
Vehicle will not stay in a straight line.
PROBLEM 2: WANDER Vehicle will not stay in a straight line. 1. Check for Cavitation Engine PFC Pump Filter L T R P p 2. Air in the system, Leaky Fitting,. 3. Low reservoir 4. Loose cylinder piston or bending of linkage Reservoir
41
Vehicle veers slowly in one direction.
PROBLEM 3: DRIFT Vehicle veers slowly in one direction.
42
Vehicle veers slowly in one direction.
PROBLEM 3: DRIFT Vehicle veers slowly in one direction.
43
PROBLEM 3: DRIFT
44
PROBLEM 3: DRIFT
45
PROBLEM 3: DRIFT
46
PROBLEM 3: DRIFT
47
PROBLEM 3: DRIFT
48
PROBLEM 3: DRIFT
49
PROBLEM 3: DRIFT
50
PROBLEM 3: DRIFT
51
PROBLEM 3: DRIFT
52
PROBLEM 3: DRIFT
53
PROBLEM 3: DRIFT
54
PROBLEM 3: DRIFT
55
PROBLEM 3: DRIFT
56
PROBLEM 3: DRIFT
57
PROBLEM 3: DRIFT
58
PROBLEM 3: DRIFT
59
PROBLEM 3: DRIFT
60
PROBLEM 3: DRIFT
61
PROBLEM 3: DRIFT
62
PROBLEM 3: DRIFT
63
PROBLEM 3: DRIFT
64
PROBLEM 3: DRIFT
65
PROBLEM 3: DRIFT
66
Vehicle veers slowly in one direction.
PROBLEM 3: DRIFT Vehicle veers slowly in one direction. 1. Single rod end cylinder slowly extends without turning the steering wheel. Note: A small rate of extension may be normal on a closed center system. L R T P p 2. Check for worn or damaged steering linkage. Fixed Pump Check the linkage Engine Filter Reservoir
67
PROBLEM 4: SLIP A slow movement of the steering wheel fails to cause any movement of the wheels. Piston Seal Leak Q i n o u t Leakage of cylinder piston seals or accessory valve between cylinder lines or ports
68
1. Thermal Shock - Caused by more than a 50 F temperature differential
PROBLEM 5: HARD STEERING Temporary hard steering or hang up: 10 F 1. Thermal Shock - Caused by more than a 50 F temperature differential L R 2. Plugged Orifice or internal relief T P p Fixed Pump Engine Filter Reservoir - 40 F
69
4. Sticking Flow Control Spool.
PROBLEM 6: ERRATIC STEERING 1. Air in the system 2. Loose Cylinder Piston L R T P 3. Thermal Shock 4. Sticking Flow Control Spool. p Fixed Pump Engine Filter Reservoir
70
Air in the system, most likely in the cylinder or lines
PROBLEM 7: SPONGY STEERING Air in the system, most likely in the cylinder or lines L R T P p Fixed Pump Engine Filter Reservoir
71
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels L R T P p Fixed Pump Engine Filter Reservoir
72
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels L R T P p Fixed Pump Engine Filter Reservoir
73
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels L R T P p Fixed Pump Engine Filter Reservoir
74
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels L R T P p Fixed Pump Engine Filter Reservoir
75
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels L R T P p Fixed Pump Engine Filter Reservoir
76
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels L R T P p Fixed Pump Engine Filter Reservoir
77
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels L R T P p Fixed Pump Engine Filter Reservoir
78
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels L R T P p Fixed Pump Engine Filter Reservoir
79
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels L R T P p Fixed Pump Engine Filter Reservoir
80
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels L R T P p Fixed Pump Engine Filter Reservoir
81
PROBLEM 8 - FREE WHEELING
Steering wheel turns freely with no feeling of pressure and no action on the steered wheels 2. Lower splines of column may be disengaged or broken L R T P 1. Steering column upper shaft is loose or damaged p Fixed Pump Engine 3. Lack of oil to steering unit or meter section: Filter Reservoir
82
2. Piston seal is blown out
PROBLEM 9 - FREE WHEELING Steering wheel turns with slight resistance but results in little or no steered wheel action. 1. Leaking crossover relief valve or anti-cavitation valve in the cylinder lines. L R T P 2. Piston seal is blown out p Fixed Pump Engine Filter Reservoir
83
2. Steering column shaft worn or damaged 1. Loose steering wheel nut.
PROBLEM 10 - EXCESSIVE PLAY 2. Steering column shaft worn or damaged 1. Loose steering wheel nut. L R T P p Fixed Pump Engine Filter Reservoir
84
PROBLEM 11 - EXCERSSIVE PLAY
T P p Fixed Pump Engine Filter Reservoir
85
1. Broken or worn linkage between cylinder and steered wheels
PROBLEM EXCERSSIVE PLAY 1. Broken or worn linkage between cylinder and steered wheels 2. Leaky Cylinder
86
PROBLEM 12 - BINDING OR POOR CENTERING OF STEERING WHEEL
1. Binding or misalignment in steering column or splined input connection L R T P 2. High back pressure in the tank line can cause slow return to center, back pressure should not exceed 300 PSI p Fixed Pump Engine Filter Reservoir 3. Large particles can cause binding between the spool and sleeve.
87
4. Thermal shock (50 degree F Temperature differential)
PROBLEM STEERING UNIT LOCKS UP 1. Large particles in the meter section 2. Severe wear 3. Broken Pin 4. Thermal shock (50 degree F Temperature differential)
88
Parts are assembled wrong. Steering unit is improperly timed
PROBLEM STEERING WHEEL OSCILLATES Problem - May turn by itself. L T R P Parts are assembled wrong. Steering unit is improperly timed
89
the wrong cylinder ports
PROBLEM TURNS THE WRONG DIRECTION Lines are connected to the wrong cylinder ports R L Left turn T P
90
PROBLEM 16 - STEERING WHEEL KICK
91
PROBLEM 16 - STEERING WHEEL KICK
92
PROBLEM 16 - STEERING WHEEL KICK
What can you do to help prevent steering kick? R L T P
93
PROBLEM 16 - STEERING WHEEL KICK
If steering wheel kicks at the start of steering - Install Inlet Check Valve - It prevents oil from returning through the steering unit when pressure on the cylinder side is greater than pressure on the inlet side to prevent steering wheel kick.
94
PROBLEM 17- INSTABILITY LOAD SENSING SYSTEMS
Hoses jump, severe vibration in hydraulic system, noise, vehicle vibration, when steering is activated. Engine PFC Pump Reservoir Filter L T R P EF CF p LS 1. Air in the lines
95
PROBLEM 17- INSTABILITY LOAD SENSING SYSTEMS
Hoses jump, severe vibration in hydraulic system, noise, vehicle vibration, when steering is activated. Engine PFC Pump Reservoir Filter L T R P EF CF p LS 1. Air in the lines 2. Harmonic system - Add hose or accumulator 3. Relief valve - Pump relief should be 300 PSI above priority relief. 4. Load sensing pump may have a sticky compensator
96
The End
Similar presentations
