JLG DVSP Series Service Manual - Manual (Page 45)

SECTION 3 - BASE COMPONENTS
3121136 – JLG Lift – 3-15
Drive Motor Brush Replacement
Each drive motor contains two (2) brushes, the brushes are
located under the two (2) large round slotted brush caps on
the front end of each drive motor.
DISCONNECT THE POWER LEADS FROM THE POWER SOURCE
BEFORE INSPECTING OR REPLACING BRUSHES.
Brush Cleaning and Inspection
Brush wear rate varies depending on the individual machine
application duty cycle. The drive motor brushes should be
inspected every 600 hrs or 1 year of operation. Brushes
should be replaced before they are less than .375 in.
(9.5mm) in length. Carbon dust accumulation should be
removed periodically. If the end shield has been removed
from the drive, a clean, dry, non-linting cloth can be used for
cleaning. DO NOT use solvents as they my damage non-
metallic parts and adversely affect subsequent brush com-
mutation.
Brush Removal
Removal of the brushes also requires the removal of the
drive motor(s) from the machine, see procedure described
earlier in this section for instructions to remove the drive
motors. If not already done, disconnect the positive (+) bat-
tery cable from the left side battery before proceding.
1. Remove the clamp and protective rubber boot from
the drive motor.
2. Unscrew the large round brush caps from each side
of the drive motor, use as large a screw driver as
possible.
3. The brushes are retained by constant-force, roll-type
springs. To remove the springs, press inward on the
end of the spring retaining bracket using the tip of a
pair of long nose pliers or other appropriate tool.
The brushes should pop out, if not, they can be
removed by pulling outward on the spring brackets
with a pair of long nose pliers after the inside ends
are unhooked.
4. Now pull the brush out of the brush box by it’s wire
(pig-tail).
NOTE: If only inspecting the brushes, it is not necessary to
remove the pig-tail terminal from it’s connection to
the brush box.
5. Loosen the screw securing the pig-tail terminal end
to the brush box and slide the terminal end out from
under the screw completely removing the brush
from the drive motor.
Drive Motor Brush Location
1. Brush Location 3. Protective Rubber Boot
2. Brush Caps (shown removed)
3
1
2
2
Brush Component Installation
1. Roll Spring 4. Brush Box Insulator
2. Roll Spring Hooks 5. Brush
3. Brush Box 6. Pigtail Wire
5
3
4
6
1
2
2