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Table 5-2. Direct Support Troubleshooting-continued -706880682
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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Table 5-2. Direct Support Troubleshooting-continued -706880684
TM 5-4210-233-14&P-1
Table 5-2. Direct Support Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE - Continued
6
LOW OIL PRESSURE - Continued
Step 2. Inspect oil pressure regulator valve for clogging or damage.
Remove and clean oil pressure regulator valve (see para 6-45).
Inspect valve, valve seat, and valve spring for damage (see para 6-45).
Replace damaged parts (see para 6-45).
Step 3. Inspect oil pressure relief valve for clogging or damage.
Remove and clean oil pressure relief valve (see para 6-45).
Inspect valve, valve seat, and valve spring for damage (see para 6-45).
Replace damaged parts (see para 6-45).
Step 4. Inspect oil pump for damaged parts.
Remove and clean oil pump (see para 6-46).
Inspect oil pump for worn, scored, or damaged parts (see para 6-46).
Replace worn or damaged parts (see para 6-46).
7
HIGH OIL CONSUMPTION
Step 1. Check if oil breather tube assemblies are clogged or damaged.
Remove and clean breather tube assembly (see para 4-140).
Step 2. Check for low air box pressure. Air box pressure, with zero exhaust back pressure, should
be 1.1 in. (27.9 mm) mercury at 1200 rpm, 3.8 in. (96.5 mm) mercury at 1800 rpm, and 5.0 in.
(127 mm) mercury at 2100 rpm.
If pressure is low, do Steps 3 and 4.
Step 3. Check if blower-to-block gasket is damaged (see para 5-21).
Replace damaged gasket (see para 5-21).
5-13

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