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MAYCO ST-45HRM CE PUMP — OPERATION & PARTS MANUAL — REV. #0 (02/23/04) — PAGE 47
6.0 OVERRUN COUPLING ASSEMBLY
The coupling is greased on assembly, but will require periodic
maintenance to ensure a smooth operation of the braking system.
Re-grease the shaft bearings via the grease nipples (Figure 46),
provided at 9,656 km (6,000 miles) or 6-month intervals. Also
ensure correct functioning of all pivots, levers, ratchets and the
spring store assembly. Grease all points of movement.
Figure 46. Meredith & Eyre Coupling with Bellows
and Shaft Nipples
The hydraulic damper (Figure 47) is sealed and maintenance
free but its operation should be checked if braking problems
occur. If the damper is to be removed, enclose it in a strong cloth
and do not stand directly in line as the damper contains oil and
gas under high pressure.
To remove, release the 2 bolts at either end. The damper will
need to be slightly pre-compressed to be fitted. This is normal,
and ensures that the braking system works efficiently and that
the trailer is towed on the drawtube, not on the damper as this
would lead to premature failure.
Figure 47. Meredith & Eyre Coupling with Damper and
Overrun Output Lever
NOTE
Meredith & Eyre Couplings do not require for
the towing ball head or eye to be removed or
loosened when replacing
Meredith & Eyre Couplings do not require for the towing ball
head or eye to be removed or loosened when replacing a damper
Knott Couplings have the damper attached to the rear bolt of the
towing head. These dampers in these couplings require a larger
amount of pre-compression when being fitted, so remove the
cast L. shaped bracket, which attaches the damper to the rear of
the couplings body and reassembly, this onto the new damper
before assembly onto the coupling body.
Nipples
Bellows
Damper
Overrun Lever
7.0 STUB AXLE / BRAKE BACK PLATE
A number of Meredith & Eyre axles feature a removable stub
axle, as shown in Figure 48. This design is unique to Meredith &
Eyre and illustrated our desire to keep replacement costs as low
as possible.
The large slotted nut on the back of the arm is torqued to 230Nm
(170 lbf.ft). Removing this nut will allow the stub axle to be
removed. When refitting, if the split pin cannot be fitted after
torque setting the slotted nut, tighten the nut further until the next
available hole is accessible
The removal of this assembly is only necessary when the stub
ale or brake back plate is to be replaced (e.g.: After an accident.)
Make a note of how these parts are fitted and the position of
thecable holder.
All other brakedrum components are accessed from the front via
thegrease cap.
All other axles have a welded stub axle and brake back plate
assembly, which cannot be replaced. In the event of damage to
a stub axle, it is likely that the whole axle will need to be replaced.
Figure 48. Meredith & Eyre Axle with
Removal Stub Axle
ST-45HRM CE CONCRETE PUMP— BRAKING SYSTEM