Harbor Freight Tools 90749 - Manual (Page 10)

SKU 90749 For technical questions, please call 1-800-444-3353. Page 10
15. In the event fast decompression of the Air Tanks (39) is required, immediately turn
off the Gasoline Engine (part #5) and pull out on the
Pull Ring of the Safety Valve
(42) until both Air Tanks have fully decompressed.
(See Figures B, and E.)
16. Pull out on the Safety Valve (42) to immediately release air pressure in the Air
Tanks (31). (See Figure I.)
17. When finished using the Air Compressor, turn off the Gasoline Engine
(5), and pull out on the Pull Ring of the Safety Valve (42) until both Air Tanks (31)
have fully decompressed. (See Figures B, and E.)
INSPECTION, MAINTENANCE, AND CLEANING
1. CAUTION! Always release all pressure from the system and disconnect all
tools from the Air Compressor before performing any inspection, maintenance,
or cleaning. Be aware that the sudden release of air from any valve or air tool can
present a danger to one’s ears.
2. BEFORE EACH USE, inspect the general condition of the Air Compressor.
Check all air fittings for leaks. Check for loose screws, misalignment or binding of
moving parts, cracked or broken parts, damaged, and any other condition that
may affect the safe operation of this tool. If abnormal noise or vibration occurs,
immediately release all pressure from the system and have the problem
corrected before further use. Do not use damaged equipment.
The Drain Plugs are located underneath each Air Tank, and should be used daily
to release all trapped moisture that may cause Air Tank corrosion. Slowly and
carefully unscrew (no more than four threads) the Drain Plugs until the
condensation begins to be released from the Air Tanks. Allow sufficient time for
all of the condensation to escape from the Air Tanks. Then, firmly retighten the
Drain Plugs. (See Figure E.)
3. DAILY: EMPTY CONDENSATION FROM THE AIR TANKS (31).
4. DAILY: Check the Air Compressor oil level. If necessary, fill with a premium
quality, 30-weight, non-detergent, compressor oil. NOTE: When checking the
Air Compressor oil level, make sure to unscrew (do not pull) the Oil Cap (23).
5. EVERY 100 HOURS OF USE: Clean the Air Filter (B4) with a mild solvent. Then,
dry and reattach the Air Filter Sleeve. (Replace the Air Filter Sleeve if it is too
dirty to properly clean.) To clean or replace the Air Filter Sleeve, remove the two
Hex Socket Set Bolts. Remove the Air Filter Cover. Remove the Air Filter Sleeve
and clean. Then, replace the Air Filter Sleeve and two Hex Socket Set Bolts.
(See Figures E, and F.)
REV 02/04