Ingersoll-Rand 7120 - Manual (Page 37)

34 7/120 (P425AWIR), 9/110 (XP375AWIR), 10/105 (HP375AWIR), 14/85 (VHP300AWIR),
7/170 (P600WIR), 10/125 (HP450WIR), 14/115 (VHP400WIR)
Engine is equipped with a primary fuel filter (or
pre–filter) with water bowl and a final filter. Both
filters are replaced at the same 500–hour
interval.
CAUTION: Escaping fluid under pressure
can penetrate the skin causing serious
injury. Relieve pressure before
disconnecting fuel or other lines. Tighten all
connections before applying pressure. Keep
hands and body away from pinholes and
nozzles which eject fluids under high
pressure. Use a piece of cardboard or paper
to search for leaks. Do not use your hand.
1. Close fuel shut–off valve, if equipped.
2. Thoroughly clean fuel filter assemblies and
surrounding areas.
3. Disconnect water sensor wiring (if equipped).
4. Loosen drain plugs and drain fuel into a
suitable container.
NOTE: Lifting up on retaining ring as it is
rotated helps to get it past raised locators.
5. Firmly grasp the retaining ring and rotate it
counterclockwise 1/4 turn. Remove ring with
filter element.
6. Inspect filter mounting base for cleanliness.
Clean as required.
NOTE: Raised locators on fuel filter canisters
must be indexed properly with slots in mounting
base forcorrect installation.
7. Install new filter elements onto mounting
bases. Be sure elements are properly
indexed and firmly seated on bases. It may
be necessary to rotate filters for correct
alignment.
If equipped with water separator bowl (E),
remove filter element from separator bowl.
Drain and clean separator bowl. Dry with
compressed air. Install bowl onto new element.
Tighten securely.
8. Align keys on filter element with slots in filter
base.
9. Install retaining ring onto mounting base
making certain dust seal is in place on filter
base. Hand tighten ring (about 1/3 turn) until
it “snaps” into the detent. DO NOT
overtighten retaining ring.
NOTE: The proper installation is indicated when
a ”click” is heard and a release of the retaining
ring is felt. A plug is provided with the new
element for plugging the used element.
10. Reconnect water sensor wiring (if
equipped).
11. Open fuel shut–off valve and bleed the fuel
system.
Checking Belt Tensioner Spring Tension
and Belt Wear (Automatic Tensioner)
Belt drive systems equipped with automatic
(spring) belt tensioners cannot be adjusted or
repaired. The automatic belt tensioner is
designed to maintain proper belt tension over
the life of the belt. If tensioner spring tension is
not within specification, replace tensioner
assembly.
Checking Belt Wear
The belt tensioner is designed to operate within
the limit of arm movement provided by the cast
stops when correct belt length and geometry is
used.
Visually inspect cast stops on belt tensioner
assembly.
If the tensioner stop on swing arm is hitting the
fixed stop, check mounting brackets (alternator,
belt tensioner, idler pulley, etc.) and the belt
length. Replace belt as needed
Checking Tensioner Spring Tension
A belt tension gauge will not give an accurate
measure of the belt tension when automatic
spring tensioner is used. Measure tensioner
spring tension using a torque wrench and
procedure outlined below:
1. Release tension on belt using a breaker bar
and socket on tension arm. Remove belt from
pulleys.
2. Release tension on tension arm and remove
breaker bar.
3. Put a mark on swing arm of tensioner as
shown.
4. Measure 21 mm (0.83 in.) and put a mark on
tensioner mounting base.
5. Install torque wrench so that it is aligned with
centers of pulley and tensioner. Rotate the
swing arm using a torque wrench until marks
are aligned.
6. Record torque wrench measurement and
compare with specification below. Replace
tensioner assembly as required.
Specification
Spring Tension—Torque 18–22 N
•
m (13–16 lb–ft)
NOTE: Threads on belt tensioner roller cap
screw are LEFT–HAND threads.
Checking Engine Electrical Ground
Connections
Keep all engine ground connections clean and
tight to prevent electrical arcing which can
damage electronic components.