Hale MG - Manual (Page 67)

Muscle Pumps
5-3
i. Test operate apparatus and certify
pump performance as required.
j. Return apparatus to service.
B. Gearbox
G-Series
(Refer to figures 5-2 and 5-3)
1. Removal
a. Place apparatus out of service in ac-
cordance with department procedures.
b. Drain oil, disconnect drive shafts,
shift switches, air connection, cooling
lines, and tachometer from gearbox as
necessary. Make sure to mark
connections for reassembly.
THE GEARBOX WEIGHT IS ABOUT 500 LBS
(228 KG) BEFORE BEGINNING DISASSEMBLY
PROPERLY SUPPORT GEARBOX WITH
LIFTING GEAR TO AID IN LOWERING
GEARBOX AND TO PREVENT PERSONNEL
INJURY.
c. Remove six 1/2-13 x 1-1/2 inch long
cap screws on the cover of the
gearbox, remove the spacer plate if
installed.
NOTE: The number of cap screws that hold the
rear bearing housing to the gearbox depends on the
model gearbox. The short gearbox uses seven cap
screws and the long gearbox uses eight cap screws.
d. Remove 7/16-14 x 1-1/4 inch long cap
screws that hold the rear bearing
housing to the gearbox. Remove the
gearbox cover.
e. Carefully lower the gearbox from the
apparatus. Place a temporary cover
over the gearbox to prevent dirt and
debris from entering the gearbox.
Move gearbox to suitable work area.
f. After the gearbox is removed,
carefully inspect bearings and other
parts for excessive wear or damage
Order new components from Hale if
replacement is required.
2. Installation
a. Install a new gasket onto the gearbox
seating surface of the rear bearing
housing. Apply a light coat of grease
to the gasket to hold it on place.
b. Place a new gasket on the seating
surface of the gearbox and gearbox
cover. Check the fit of the gasket and
carefully trim the gasket to match the
contour of the gearbox.
c. Carefully lift the gearbox into place
around the rear bearing housing.
Insert two or three 7/16-14 x 1-1/4
inch long cap screws through the rear
bearing housing to help hold the
gearbox in place.
d. Position the gearbox cover and insert
six 1/2-13 x 1-1/2 inch long cap
screws. Tighten cap screws hand
tight.
e. Insert the remainder of the 7/16-14 x
1-1/4 inch long cap screws through
the rear bearing housing and gasket
into the gearbox and cover. Tighten
the 7/16-14 x 1-1/4 inch long cap
screws. Torque the 7/16-14 x 1-1/4
inch long cap screws to 40 ft-lb (54
N-m). Tighten the 1/2-13 x 1-1/2 inch
long cap screws to 65 ft-lb (88 N-m).
f. Connect drive shafts, cooling lines, air
hoses, and electrical connections to
gearbox.
g. Fill gearbox with oil.
h. Test operate apparatus observing
packing or mechanical seal, oil seal,
and gaskets for leaks.