jcb 1CX, Руководство по обслуживанию

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13 - 6
Dismantling and Assembly
up to machine number 807172
Dismantling
Drain the oil from the motor.
Mark the relative positions of the front case 2, rear case 21
and brake housing 60.
Remove capscrews 33 and separate the rear case and brake
housing assembly from the front case and cam assembly.
Support the front case and cam assembly on blocks.
Separate cam 20 from front case 2.
Note: On later motors the output shaft is supported by two
taper roller bearings which are preloaded. The dismantling
and assembly of this part of the motor is covered on the next
page.
Press shaft 1 out of bearing 7. Note that on later motors, shaft
1 has a male end, not female as shown.
Using a suitable puller, remove bearing 7 from front cover 2.
Remove shaft seal 11 from front case 2. Discard the shaft
seal.
Remove O-ring 32 from front case 2. Discard the O-ring.
Separate cylinder block 15 from cam 20.
Remove circlips 18 and retaining rings 19 from cylinder block
15.
Withdraw pistons 17 and rollers 16 from cylinder block 15. If
difficulty is experienced, low pressure air can be applied to
the ports in the cylinder block.
Remove and discard the O-rings fitted to pistons 17.
Withdraw brake shaft 61 from rear case and brake housing
assembly.
Tap rear case 21 lightly with a rubber mallet to release
distributor ring 22.
Remove O-ring 32 from rear case 21. Discard the O-ring.
Make a note of the position of stop pin 23 in the slot in rear
case 21 then remove the stop pin.
Note: To ensure that motor rotation is correct on re-
assembly, the slots in the rear case are identified ‘L’ or ‘R’.
Note that the actual position of the motor may be opposite to
that indicated on the serial plate (see parts catalogue).
Remove seal rings 26, 27, and 28 from distributor ring 22.
Discard the seal rings.
Remove springs 24 from their bores in distributor ring 22.
Unscrew plug 65 from end cover 64. Remove and discard O-
ring 73.
Unscrew capscrews 74 in a progressive manner then remove
end cover 64 from brake housing 60. Remove and discard
gasket 70.
Withdraw spring disc 78 from brake housing 60.
Insert a suitable bolt in the tapped hole in brake piston 62 and
withdraw the brake piston from brake housing 60.
Remove seal 71 from brake piston 62. Discard the seal.
Unscrew capscrews 75 and separate brake housing 60 from
rear case 21. Remove and discard O-ring 31.
Remove seal 72 from interior of brake housing 60. Withdraw
brake pack comprising inner plates 67 and outer plates 66
from brake housing 60, together with shims 68 and 69 (if
fitted).
Assembly
Assembly is a reversal of the dismantling procedure.
Inspect the inner plates 67 and outer plates 66 for signs of
wear or damage. Plates should not be renewed individually,
the entire plate pack should be renewed.
Clean all components and oil before assembly. All new seals
and O-rings should be greased with petroleum jelly.
The space between the lips of shaft seal 11 should be filled
with JCB HP Grease.
The contact surfaces of spring disc 78 should be coated with
JCB Special MPL Moly grease.
If a new plate pack is to be fitted, the overall plate pack
dimension X (when clamped) must be between 28.1 and 28.3
mm. The desired dimension should be achieved using shims
68 and 69 fitted between the end of the plate pack and the
rear case 21 as shown. One or two additional outer plates 66
may be used to reduce the number of shims if required.
Thoroughly degrease capscrews 75 and 33 and mating parts,
then assemble using JCB Threadlocker and Sealer.
Examine pistons 17 and their bores in cylinder block 15 for
signs of damage. Replace as necessary.
Inspect springs 24 for signs of damage and/or distortion.
Replace as necessary.
Torque Settings
Item Nm lbf ft kgf m
33 117 - 122 86 - 90 11.9 - 12.4
74 14 - 16 10 - 12 1.4 - 1.6
75 70 - 77 52 - 57 7.1 - 7.8
Section E Hydraulics
9803/8550
Section E
13 - 6
Issue 3*
Drive Motors
*
*
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