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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 | ................................................................................. | |Engine-driven pump|Inspect quick-disconnect for|Replace hose. | | |supply hose quick-|breakage. | | | |disconnect broken.| | | | |Center body of | | | | |disconnect may | | | | |have broken loose,| | | | |obstructing flow. | | | .................................................................................
 |  |Faulty check  |Pin landing gear.  Turn on  |Replace check  |
 |  |valves in nose  |System A electric motor- |valves.  |
 |  |landing gear  |driven pump.  Select gear  |  |
 |  |steering lines  |Down, after 5 minutes feel  |  |
 |  |(System A only).  |check valves; if hot, re- |  |
 |  |If leaky, these  |place check valve.  Select  |  |
 |  |check valves can  |gear Up, after 5 minutes,  |  |
 |  |allow flow to go  |feel check valves; if hot,  |  |
 |  |directly from  |replace.  |  |
 |  |pressure to return|  |  |
 |  |(Landing gear Up  |  |  |
 |  |to Down, or Down  |  |  |
 |  |to Up), creating a|  |  |
 |  |high flow demand  |  |  |
 |  |and possible re- |  |  |
 |  |duced system  |  |  |
 |  |pressure.  |  |  |

 ................................................................................. | |Faulty engine-| |Replace pump. | | |driven pump. | | | 2..............…..................…............................…................1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 4. Standby Hydraulic System Trouble Shooting Chart
_______________________________________________ ~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | .................................................................................
 Low|  Faulty pressure|  |  Check for continuity at  |  Replace|
 pressure|  switch|  |  standby pressure module  |  pressure|
 light|  |  |  pressure switch. If  |  switch|
 illuminated|  |  |  there is continuity,  |  (AMM 29-34-31).|
 | pump  |  |  |  |
 | operating  |  |  |  |
 |  |  |  |  |
 Pump|  Faulty standby|  |  Check indicator on  |  Replace|
 operating,|  rudder shutoff|  |  standby rudder shutoff  |  standby rudder|
 standby|  valve|  |  valve. If closed,  |  shutoff valve|
 rudder not|  |  |  |  (AMM 27-21-94).|
 | powered  |  |  |  |
 |  |  |  |  |
 Pump|  Faulty leading|  |  Check indicator on  |  Replace|
 operating|  edge device|  |  leading edge device  |  leading edge|
 leading|  shutoff valve|  |  shutoff valve. If  |  device shutoff|
 edge|  |  |  closed,  |  valve|
 devices not|  |  |  |  (AMM 27-81-91).|
 | deploying  |  |  |  |
 |  |  |  |  |
 Pump not|  Faulty standby|  |  Check for power and  |  Replace|
　
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