DeWalt DCMPS520 - Assembly and Adjustments; Inserting and Removing the Battery Pack; Installing the Guide Bar and Saw Chain; Adjusting Chain Tension

14
ENGLISH
ASSEMBLY AND ADJUSTMENTS

WARNING: To reduce the risk of serious personal
injury, turn tool off and disconnect battery pack
before making any adjustments or removing/
installing attachments or accessories. An accidental
start‑up can causeinjury.

WARNING: Use only DeWALT batteries andchargers.
5. Ensure the saw chain is properly set in the slot around the
entire guidebar.
6. Place the saw chain around the sprocket
22
while lining up
the slot on the guide bar with chain tensioning pin
19
, and
the bolt
18
, on the base of the tool as shown in Fig.D.
7. Once in place, hold the bar still, replace chain assembly
cover
7
. Install the rear of the sprocket cover first, rotate
it down and make sure the bolt hole on the cover lines up
with the bolt
18
on the mainhousing.
8. Install the bar lock nut
8
and rotate clockwise with the
wrench
13
provided until snug , then loosen nut one full
turn, so that the saw chain can be properlytensioned.
9. Rotate the chain tensioning screw
9
clockwise to increase
tension as shown in Fig.D. Make sure the saw chain
5
is
snug around the guide bar
4
. Tighten the bar lock nut
8
untilsnug .
10. Follow the instructions in the section Adjusting
ChainTension.
Adjusting Chain Tension (Fig. A, C–F)

WARNING: Incorrect saw chain tension can cause the
saw chain to come off of the guide bar and could cause
serious injury or death.
NOTE: Saw chain tension should be adjusted regularly before
eachuse.
1. With the saw still on a firm surface check the saw chain
5
tension. The tension is correct when the saw chain snaps
back after being pulled 1/8" (3 mm) away from the guide
bar
4
with light force from the middle finger and thumb
as shown in Fig.E. There should be no “sag” between the
guide bar and the saw chain on the underside as shown in
Fig.F.
2. To adjust saw chain tension, loosen bar lock nut
8
.
3. Rotate the chain tensioning screw
9
in the front of the
housing using the flat screwdriver end of thewrench 
13
.
4. Check saw chain tension, adjust ifneeded.
5. Do not over-tension the saw chain as this will lead to
excessive wear and will reduce the life of the guide bar and
saw chain.
6. Once saw chain tension is correct, tighten bar lock nut
8
untilsnug . Torque the bar lock nut
8
to 6 ft-lbs (8 Nm).
7. A new chain stretches slightly during the first few hours of
use. It is important to check the tension frequently (after
disconnecting battery remove the battery pack) during the
first twohours ofuse.
Installing the Guide Bar and Saw Chain
(Fig. A, C–G)

CAUTION: Sharp chain. Always wear protective gloves
when handling the saw chain. The saw chain is sharp and
can cut you when it is notrunning.

WARNING: Sharp moving chain. To prevent accidental
operation, ensure that battery is removed from the tool
before performing the following operations. Failure to do
this could result in serious personalinjury.
If the saw chain
5
and guide bar
4
are packed separately in the
carton, the chain has to be attached to the bar, and both must
be attached to the body of thetool.
1. Place the saw on a flat, firmsurface.
2. Rotate the bar lock nut
8
counterclockwise with the
wrench
13
provided.
3. Remove chain assembly cover
7
and bar lock nut
8
.
4. Wearing protective gloves, grasp the saw chain
5
and wrap
it around the guide bar
4
, ensuring the teeth are facing the
correct direction (Fig.G).
Replacing the Saw Chain (Fig.A, C–G)

WARNING: Sharp moving chain. To prevent accidental
operation, ensure that battery is removed from the tool
before performing the following operations. Failure to do
this could result in serious personalinjury.

CAUTION: Sharp chain. Always wear protective gloves
when handling the saw chain. The saw chain is sharp and
can cut you when it is notrunning.

CAUTION: The chain speed of this product is 8.6 m/s. Only
use chains that are rated at greater than 8.6 m/s.
Inserting and Removing the Battery Pack
from the Tool (Fig.B)
NOTE: Make sure your battery pack
16
is fullycharged.
To Install the Battery Pack into the Tool Handle
1. Align the battery pack with the rails inside the tool’s
handle(Fig. B).
2. Slide it into the handle until the battery pack is firmly seated
in the tool and ensure that you hear the lock snap intoplace.
To Remove the Battery Pack from the Tool
1. Press the battery release button
17
and firmly pull the
battery pack out of the toolhandle.
2. Insert battery pack into the charger as described in the
charger section of thismanual.
Fuel Gauge Battery Packs (Fig.B)
Some DeWALT battery packs include a fuel gauge which
consists of three green LED lights that indicate the level of
charge remaining in the batterypack.
To actuate the fuel gauge, press and hold the fuel gauge
button
20
. A combination of the three green LED lights will
illuminate designating the level of charge left. When the level
of charge in the battery is below the usable limit, the fuel gauge
will not illuminate and the battery will need to berecharged.
NOTE: The fuel gauge is only an indication of the charge left on
the battery pack. It does not indicate tool functionality and is
subject to variation based on product components, temperature
and end-userapplication.