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Section E
77 - 2
Removal and Replacement
- Slew Ram
Removal
Slew the backhoe to the left to remove the right hand
1
slew ram and visa versa.
2
Lower the bucket to the ground and switch off the
engine.
! WARNING
Hydraulic fluid at system pressure can injure you. Before
disconnecting or connecting hydraulic hoses, stop the
engine and operate the controls to release pressure
trapped in the hoses. Make sure the engine cannot be
started while the hoses are open.
INT-3-1-11/1
3
Vent any residual hydraulic pressure by operating the
backhoe and slew control levers.
Disconnect the hydraulic hoses 1 to the slew rams -
4
before disconnecting the hoses make sure that they are
labelled (to assist with reassembly).
5
Plug and cap all open hydraulic connections to prevent
ingress of dirt and loss of hydraulic fluid.
6
Loosen and remove trunnion bracket retaining nuts 2
and hardened washers 2A (see note).
Note: On assembly, the correct grade of nut (grade 12) and
bolt (grade 10.9) must be used. Also, use hardened washers
2A - NOT ordinary washers. Using incorrect specification
items could result in a reduction of clamping efficiency.
7
Remove the trunnion bracket 3.
! CAUTION
This component is heavy. Do not attempt to remove it
unless its weight is held by a sling. Make sure that the
sling is attached to a suitable lifting appliance.
HYD 2-3/1
8
Attach suitable lifting straps to the slew ram assembly.
Note that the weight of the slew ram assembly is
approximately 44 kg (97 lbs).
9
Remove thin nuts 4 ( 2 off per pivot pin) and remove the
pivot pin retaining bolt 5. Use a 25 - 30 mm diameter
bar to knock the pin out vertically.
10
Remove the slew ram (eye end) pivot pin 6 and swing
the ram to clear the kingpost casting.
11
Lift the slew ram assembly clear of the machine.
9803/3280
Hydraulics
Hydraulic Rams
Purchased from www.WorkshopManuals.co.uk
Inspection
Inspect the liner bearings 7 (located in the trunnion retaining
bracket 3) and liner bearing 8 for signs of damage, wear,
scores or nicks etc. Replace as required.
To remove the liner bearing 8 use a jack located against
blanking plate 9. Shown in the inset at Y.
To remove the bearing liner 7 from the trunnion bracket use
flat faced bearing pullers.
Replacement
! WARNING
Fine jets of hydraulic fluid at high pressure can
penetrate the skin. Do not use your fingers to check for
hydraulic fluid leaks. Do not put your face close to
suspected leaks. Hold a piece of cardboard close to
suspected leaks and then inspect the cardboard for
signs of hydraulic fluid. If hydraulic fluid penetrates your
skin, get medical help immediately.
INT-3-1-10/1
Replacement is generally a reversal of the removal
procedures, however note the following:
The liner bearings 7 and 8 have a 'lead-in' diameter
(noticeable with a slight step), always install the smaller
diameter first into the pivot bore. The bearings must be
installed so that they sit flush.
The eye end pivot pins 6 should be secured first - i.e.
BEFORE the trunnion bracket retaining nuts 2, this will help
to maximise ram assembly alignment.
Make sure that the hydraulic hoses are correctly installed.
Make sure that any new or reused bearings are clean and
smeared with grease prior to reassembly of pins and
trunnion journals.
When fully assembled, apply grease at each grease nipple
BEFORE operating the machine.
Torque Setting
Item
Nm
lb ft
kgf m
650
480
66.3
2
Section E
77 - 2
Issue 1
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