Section E - Hydraulics
Pumps
Transmission Pump - Series 1 Machines
E-76 E-76
9803-9340-8
Dismantling and Assembly
The numerical sequence shown on the illustration is
intended as a guide to dismantling
K Fig 2. ( T E-75).
For assembly the sequence should be reversed.
The full dismantling procedure is for reference only, some
of the parts may not be available as service replacements.
If the pump has failed during the warranty period, then a
complete strip down is not advised.
Dismantling
Thoroughly clean the pump before any dismantling and
repair is attempted.
1 Support the pump with the input shaft down. Use a 9/
16 in. socket to remove the two bolts 1 and lift off the
gear pump.
2 Remove the gear pump ‘O’ ring 2.
3 Use a 7/16 in. Allen wrench to remove the charge
pressure relief valve spring retainer 3 from the pump
adaptor assembly.
4 Use a pencil magnet or similar tool to carefully
remove the charge pressure spring 4 and poppet 5
from the pump adaptor assembly. Take care not to
drop the charge pump poppet into the pump adaptor
assembly.
5 Use a 7/8 in. socket to remove the bypass valve
assembly 6 from the back plate.
6 The internal seal may be replaced by first removing
the small retaining ring 6a on the end of the bypass
valve. Remove and replace ‘O’ rings 6d and 7.
7 Use a 11/16 in. socket to remove the two high
pressure relief valves 8 from the pump back plate
assembly. Each system relief valve assembly is
identified by both its part number and relief valve
setting.
8 Firmly support the pump assembly. Use a 9/16 in.
socket to remove the four cap screws 9 retaining the
charge pump adapter assembly.
9 With the cap screws removed, remove the charge
pump adaptor assembly 10 from the back plate.
10 Turn the adapter assembly over. Remove ‘O’ ring 11.
11 Inspect the gerotor pocket and needle bearing 12
located in the charge pump adapter. The needles in
the needle bearing must remain intact in the bearing
cage. Renew the bearing if necessary (see
assembly).
12 Remove the charge pump outer 13 and inner 14
gerotor ring. Then remove drive key 15 from the pump
shaft.
13 To separate the back plate assembly 16 from the
dowel pins in the pump housing 40, insert two
screwdrivers between the back plate and housing
assemblies and prise apart.
14 After separation, remove the back plate from the
housing.
15 Turn the back plate assembly over and inspect
needle bearing 17. The needles in the bearing must
remain intact in the bearing cage. Renew the bearing
if necessary (see assembly).
16 With the back plate removed, remove gasket 18 from
the pump housing assembly and discard.
17 Remove valve plate 19 from the piston block
assembly.
Note: The valve plate may have stuck to the back plate
assembly.
18 Valve plate directional rotation (CW or CCW) is
identified by the location of the metering slots X.
Pump input rotation should always turn into the
metering slots. This machine is fitted with a clockwise
valve plate, shown on the right.
707550-1
Fig 3.
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