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____ bench before pump installation. Pump pressure adjustments should not be attempted while pump is installed on the airplane because of the internal bleed characteristics of the hydraulic system.
 ~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................. | System A or B System pressure| | Replace pressure indicator | Replace system|
 |  pressure  transmitter or|  |  with known correct  |  pressure |
 |  above 3200  indicator|  |  indicator.  If pressure  |  transmitter |
 |  psi  |  |  remains high using EDP or  |  (AMM 29-31-12) |
 |  |  |  EMDP, |  |
 |  |  |  |  |
 |  Case drain filter| |  Examine the filter for  |  Replace the |
 |  clogged|  |  contamination  |  case drain and |
 |  |  |  |  pressure |
 |  |  |  |  filter element.|
 |  |  |  |  Flush the |
 |  |  |  |  lines and |
 |  |  |  |  replace the |
 |  |  |  |  pump. |
 |  |  |  |  |

 | System A or B Flight control or| | Position applicable flight | Perform flight| | pressure |spoiler leakage | control and spoiler switch | control and| | below 2800 | | OFF. If pressure recovers | spoiler leak| | psi (both | | to within limits, | check.| | pumps | | | Replace| | operating | | | components as| | | | | necessary.| | | | | | | | | If pressure remains low | Replace systems| | | | | pressure module| | | | | (AMM 29-15-71).| | | | | |
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | .................................................................................
 |  ENG (1 or 2)  The electric|  |  Operate the EDP with the  |  If the system |
 |  LOW PRESSURE  motor driven|  |  EMDP off.  Stop the EDP  |  operates as |
 |  light is slow pump (EMDP) was|  |  and make sure the ENG LOW  |  shown in the |
 |  to come on  on when you|  |  PRESSURE light comes on.  |  Isolation |
 |  after the  stopped the|  |  Start the EMDP and make  |  Procedure to |
 |  pump is  engine driven|  |  sure the ENG LOW PRESSURE  |  the left, the |
 |  stopped.  pump (EDP).|  |  light stays on.  |  system is O.K. |
 |  |  |  |  No repairs are |
 |  |  |  |  necessary. |
 |  |  |  |  |
 |  ENG (1 or 2)  Leaking check|  |  Operate the EDP with the  |  Replace leaking|
 |  LOW PRESSURE  valve in pressure|  |  EMDP off. Stop the EDP  |  check valve. |
 |  light goes  module or in|  |  and make sure the ENG LOW |  |
 |  off when the  pressure line|  |  PRESSURE light comes on. |  |
 |  EMDP is  to thrust|  |  |  |
 |  operated  reverser.|  |  |  |
 |  |  |  |  |
 |  Hydraulic  Hydraulic leak|  |  Perform leak check  |  Repair or |
 |  fluid  |  |  (AMM 29-00-00/601).  |  replace |
 |  quantity  |  |  |  defective |
 |  low  |  |  |  components. |
 |  |  |  |  |
 |  Fluid quantity|  |  (AMM 29-33-01/101) |  |
 |  indicating|  |  |  |
 |  |  |  |  |
 |  Hydraulic fluid|  |  See steps for  |  Use correct |
　
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