Operation and maintenance manual

Section 230-0050
SM 1394 Rev1 12-04
3
ASSEMBLY
Numbers in parentheses refer to Fig. 1.
1. If removed, install bearings (7) in front cover (2) and
body housing (1) using an arbor press. Lightly oil
bearing (7) outside diameter with mineral oil prior to
insertion.
Note: Assemble bearings (7) in body housing (1)
bores with the bushing split line positioned at
3 o'clock. The lubrication groove will be positioned at 1
o'clock.
Note: Assemble bearings (7) in the front cover (2)
bores with the bushing split line positioned at
9 o'clock. The lubrication groove will be positioned at
11 o'clock, as shown in Fig. 3.
INSPECTION
Numbers in parentheses refer to Figs. 1.
1. Clean all parts in a suitable solvent and dry with
compressed air.
2. Check driveshaft and gear (11) and driven gear (12)
carefully for wear. Remove burrs or light score marks
from gear faces and teeth with an India stone. Heavy
scoring, grooving or burring of gear teeth OD requires
gear replacement. Nicked, grooved or fretted gear
tooth mating surfaces also requires gear replacement.
Any wear of gear hubs in excess of 0.025 mm (0.001
in), or detectable by touch, requires gear replacement.
Note: Since both driveshaft and gear (11) and driven
gear (12) of a set are matched, they must be replaced
as a set if one is worn or damaged.
3. If gears are replaced, bearings (7) must be replaced
at the same time. Bearings (7) should fit into their
bores with a heavy press fit.
4. Check the centre of wear plates (13 & 14) at the
point of meshing of driveshaft and gear (11) and driven
gear (12). Erosion indicates contaminated oil. Pitting
indicates cavitation or aeration of the oil supply.
Discoloured wear plates are a sign of the pump over
heating.
Wear plate (13 & 14) side wear permits oil to bypass
gears and allows internal oil slippage and reduced
pump efficiency. Check wear plate (13 & 14) wear
against the size of new wear plates. Replace wear
plates (13 & 14) if worn in excess of 0.05 mm
(0.002 in).
5. Deburr all machined surfaces of port end body
housing (1), front cover (2) and mounting flange (3)
with a medium grit India stone. Replace gear housing
(2) if wear on machined surfaces exceeds 0.127 mm
(0.005 in).
6. Replace all wear plate seals (8), backup seals (9),
ring seal (10) and lip seals (18 & 19).
7. Clean parts in a suitable solvent and dry with
compressed air after deburring surfaces.
Body System - Main Hydraulic Pump
Fig. 3 - Bearing Lubrication Groove Position
SM - 1865
7
7
OUTLET
(SMALL PORT)
INLET
(LARGE PORT)
INLET
(LARGE PORT)
OUTLET
(SMALL PORT)
LUBRICATION
GROOVE TYP.
BEARING SPLIT LINE
INSTALL BEARING IN
POSITION SHOWN
WITHIN ± 5˚ TYP.
VIEW SHOWING FRONT COVER
ITEM 2 ONLY
VIEW SHOWING
BODY HOUSING
ITEM 1 ONLY