29-15-00
ALL ú ú 02 Page 101 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
H. If either engine No. 1 or 2 fire switches are positioned to FIRE with the corresponding engine-driven pump operating, proceed with the following steps:
(1)
If a supply shutoff valve was closed for less than 5 minutes, no maintenance is required and shutoff periods are not accumulative.
(2)
If supply shutoff valve was closed for longer than 5 minutes, ensure that pump has operated at least one minute with supply fluid available before checking filter elements so that metal contamination, possibly generated during fluid shutoff, has reached the filter.
(a)
Check case drain filter element for metal contamination (Ref 29-15-91, MP).
(b)
Check pressure filter for metal contamination (AMM 29-15-71/201).
(c)
If no metal is found in either filter, install new filters and continue to run pump. Recheck filters in 200 hrs.
(d)
If metal is found, remove applicable pump for overhaul and flush lines between the pump and filters (Ref I/C).
2. Prepare for Trouble Shooting____________________________
A. Service hydraulic reservoir(s) (AMM 12-12-00/301).
NOTE: Standby system is serviced along with System B.
____
B. Pressurize hydraulic reservoir(s) (AMM 29-09-00/201).
C. Provide electrical power (AMM 24-22-00/201).
D. Check that parking brake is set.
E. When trouble shooting engine-driven pumps, pressurize system by operating or motoring engine (AMM 71-00-00/201).
F. When trouble shooting using an electric pump, position applicable ELEC hydraulic pump switch (P5) ON.
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29-15-00
ALL ú ú 02 Page 102 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
3. Hydraulic System A or B Trouble Shooting Chart
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NOTE: Hydraulic pump high and low pressure adjustments are made on a test
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