13
GB947 HYDRAULIC POWER UNIT
8/23
MAINTENANCE Cont.
REPLACING MOTOR CARBON BRUSHES
Replace when
.118”
long or less
.749” / .867”
(New)
Images may not reflect actual tool.
To help prevent premature failure of the armature, replace the carbon brushes: (IF BRUSH MEASURES
.118” (3
mm) LONG OR LESS):
1. Unthread and remove the carbon brush seat (947142) and carbon brush (947141). See
caution
above.
Note: The brush assemblies must be replaced if they measure
.118” (3
mm) long or less.
New carbon brushes will measure between
.749” (19
mm) and
.867” (22
mm) long.
2. Re
-
Install new brush assemblies (947141) with the carbon brush seats (947142) and tighten securely. See
caution
above.
Checking the motor carbon brushes (947141) consistently helps to prevent premature failure of the armature. See pg. 21 for parts breakdown.
To help prevent premature failure of the armature, inspect the brushes EVERY 3 MONTHS OR 300 HOURS (depending on use):
To inspect carbon brushes (947141) follow these steps:
1. Using a large flat head screw driver, unscrew and remove the 2X carbon brush seat (947142). See
caution
above.
2. Remove the 2X carbon brushes (947141). See
caution
above.
3. Clean copper commutators on the armature.
4. Clean out the spaces between connections. If commutator is damaged or worn, replace armature.
5. Measure the length of the carbon brush (947141), and replace both brushes if either one is .118 inch (3 mm) or less in length.
6. Re
-
install brush assemblies and brush seats. Using a large flat head screw driver, tighten brush seats. See
caution
above.
1. When not in use, depressurize and disconnect hydraulic hoses from application.
2. Thoroughly wipe clean.
3. Store in clean, dry environment. Avoid temperature extremes.
4. For transportation or long term storage, shield pump with a protective cover.
STORAGE
INSPECTING MOTOR CARBON BRUSHES (EVERY 3 MONTHS OR 300 HOURS)
Remove brush seats and
brush assemblies (2X)
HYDRAULIC THREAD PREPARATION
IMPORTANT:
Be sure to use thread sealant on all hydraulic fittings, Loctite® 545 or equivalent or a non
-
hardening Teflon® thread
compound such as Slic
-
tite®. Tighten until fitting feels snug and then continue to tighten 1/2 to 1 full turn.
CAUTION:
Over tightening
can easily distort the threads. DO NOT USE TEFLON® TAPE.
CAUTION:
Teflon® tape is an excellent thread sealer, however, if it is not
properly applied, pieces of Teflon® may enter the hydraulic system and cause a malfunction or damage.
CAUTION
:
Springs on the carbon brushes (947141) will push on the carbon brush seats (947142). Hold the brush seats (947142)
as they are loosened and removed.