Transfer Case Fluid - Hummer H1 Service Manual

1-26 General Information, Lubrication and Maintenance
Fuel Filter Service
Replace the filter element every 6,000 mi (9,600 km), or annu-
ally, whichever occurs first (Figure 1-21). See ÒPurging Air
From Diesel FilterÓ (Section 3).
Figure 1-21: Fuel Filter Location
Transmission Fluid
TRANSMISSION
DIPSTICK AND
FILL TUBE
Figure 1-22: Transmission Dipstick Location
Replace the transmission fluid filter each time the fluid is
changed. Refill the transmission with Dexron
Check transmission fluid level at least once each month. Proce-
dure is as follows:
1.
2. Position vehicle on level surface.
FUEL FILTER
3. Shift transmission into Park.
4. Operate engine at curb idle speed.
5.
6. If fluid level is too high, remove excess through fill tube
CAUTION: Do not overfill the transmission. The excess fluid
will be churned into foam resulting in overflow from the fill
and vent tubes, slip and flare during upshifts, fluid breakdown
and eventual clutch failure.
7. Check fluid color and condition. Normal color ranges

Transfer Case Fluid

Check transfer case fluid level every 3,000 mi (4 900 km), or
semiannually, whichever comes first. Remove fill plug and
gasket. Level should be within 1/2 in. (12.7 mm) of fill plug
opening when transfer case is level. Install fill plug and gasket,
and tighten to 15-25 lb-ft (20-33 N¥m). Change fluid every
12,000 mi (19 000 km) or annually, whichever occurs first
(Figure 1-23).
Inspect rubber plug in the shift rail roll pin access passage lo-
cated near the shift lever for leakage. Replace plug if leakage is
present.
¨
III afterward.
Figure 1-23: Transfer Case Fill/Drain Plug Location
________________
Drive vehicle until transmission ßuid is at normal operating
temperature. Fluid must be hot to obtain accurate reading.
Remove transmission dipstick and check level (Figure 1-22).
Correct level is within crosshatch marks on dipstick.
using suction gun and 3/16-in. teflon tubing. If level is
low, check for leaks and, if OK, add fluid in 1-2 ounce
increments until level is correct.
from dark red to light pink. Fluid that is dark brown, black,
or orange and full of bubbles indicates a problem that may
require overhaul.
DRAIN PLUG
FILL PLUG
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