Door Jamb Bolt Adjustment - Komatsu 830E-AC Shop Manual

Door Jamb Bolt Adjustment

Over a period of time, the door latch mechanism and
door seals may wear and allow dirt and moisture to
enter the cab. To insure proper sealing of the door
seals, the door jamb bolt may need to be adjusted
periodically.
FIGURE 3-3. DOOR JAMB BOLT ADJUSTMENT
1. Washer
2. Striker Bolt
Step A. If the door closes, but not tightly enough to
give a good seal between the seal on the door and
the cab skin:
1. Mark the washer location (1, Figure 1) portion of
the door jamb bolt with a marker, pen, or pencil
by circumscribing the outside edge of the
washer onto the jamb.
2. Loosen the door jamb bolt (2) and move straight
inwards 1/16" and retighten.
3. Hold a piece of paper such as a dollar bill
between where the door seal (4) will hit the skin
of the cab and firmly close the door ensuring
that it latches on the second catch. (The door
latch mechanism has a double catch mecha-
nism.)
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3. Frame
4. Seal
Truck Cab
4. The door seal should firmly grip the paper all
along the top, front, and bottom edge of the
door. If the paper is loose all around, REPEAT
STEP 2. If the paper is firmly gripped, but can
be removed without tearing it, open door and
tighten the jamb bolt completely without affect-
ing the adjustment.
5. If the paper slips out from the door seal easily
along the top and not at the bottom, the door
itself will have to be "adjusted". Or if the paper
slips out easier at the bottom than at the top,
the door will have to be "adjusted".
• If seals are tight at bottom of door, but not at top,
place a 4 x 4 block of wood at the bottom edge of
the door, below the handle. Close the door on the
wood block and press firmly inward on the top
corner of the door. Press in one or two times,
then remove the wood block and check seal
tension again using the paper method. Seal
compression should be equal all the way around
the door. If seal is still loose at the top, repeat
procedure again until seal compression is the
same all the way around.
• If seal compression is greater at the top than at
the bottom of the door, place a 4 x 4 block of
wood at the top corner of the cab door. Then
press firmly inward on the lower corner of the
door. Press in one or two times, then remove the
wood block and check seal compression again.
Seal compression should be equal all the way
around the door. If seal is still loose at the
bottom, repeat procedure again until seal
compression is uniform all the way around.
Step B. If the door springs back when trying to close
it, the striker bolt (2, Figure 2-4) has probably loos-
ened and slipped down from where the catch can
engage with the bolt.
1. Open the door and close both claws (3 & 5, Fig-
ure 2-4) on the catch until they are both fully
closed.
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