Fixed Flow
Dismantling and Assembly (continued)
Assembling
When carrying out the following procedure, renew all seals
and O-rings. Lubricate using JCB Special Hydraulic Fluid.
1 Fit shaft seals 22 into mounting flange 19, making sure
the seal lips are the correct way round as noted in
dismantling. Fit circlip 21 into its groove in the flange.
Coat the seal lips with high melting point grease.
Note: If the seal recess is scored, it is permissible to seal
outside diameter with JCB Multigasket to prevent leakage.
2 Stand front body 5 on its rear face. Fit seal 25 and seal
energiser 26 into balance plate 24.
3 Ensuring that the seals do not fall out, carefully feed the
balance plate into the bores of the front body 5 with the
two small holes through the balance plate to the low
pressure side of the body (i.e. side with the large 4-bolt
port pattern).
4 Insert driveshaft 23 and driven gear 27 into the original
bores.
5 Fit balance plate 28 over the driveshaft and gear stub.
Insert seal 29 and seal energiser 30 into the balance
plate.
6 Fit O-ring 31 into the groove on mounting flange 19.
7 Apply a small amount of JCB Multigasket to the face of
front body 5 which seals with mounting flange 19 (i.e.
the face containing the clamping bolt holes).
8 Carefully feed mounting flange 19 over driveshaft 23 in
its original position, as marked earlier. Use a soft faced
hammer to tap the flange onto its location spigot.
9 Support the front pump assembly on the mounting
flange (but not the driveshaft). Fit O-rings 8 into the
grooves on the rear face of the front body 5. Install
splined coupling 7.
10 Fit rear body 6 onto front body 5 in its original position,
as marked earlier, ensuring that it locates on the dowels
and that the clamping bolt holes line up.
11 Fit seal 16 and seal energiser 17 into balance plate 15.
Ensuring that the seals do not fall out, carefully feed the
balance plate into rear body 6 with the two small holes
through the balance plate to the low pressure side (i.e.
side without a port).
12 Fit drive gear 10 so that it locates with splined coupling
7. Fit driven gear 14.
13 Fit balance plate 11 in its original position (i.e. with the
two small holes to the low pressure side). Fit seal 12
and seal energiser 13 into the balance plate.
14 Fit O-ring 18 into end cover 9.
15 Apply a small amount of JCB Multigasket to the
exposed face of rear body 6 (i.e. the face containing
the clamping bolt holes).
16 Fit end cover 9 in its original position, as marked
earlier.
17 Install the four bolts 3, each with a serrated washer 4,
and tighten evenly and progressively to a torque of 90 -
100 Nm (66 - 74 lbf ft).
18 Pour a small amount of clean JCB Special Hydraulic
Fluid into the ports. Check that driveshaft 23 rotates
without undue force. If excessive force is required it is
possible that one or more of the balance plate seals are
trapped, in which case it will be necessary to dismantle
and assemble the pump again.
31 - 4
Section E
Hydraulics
9803/3280
Section E
31 - 4
Issue 1
Main Pump
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