
TANKERS
OPERATING & SAFETY INSTRUCTIONS
FOR SPARE PARTS GO TO
WWW.MARSHALL-TRAILERS.CO.UK
FOR MODELS:
ST1200, ST1400, ST1600, ST1800,
ST2000, ST2300, ST2550
CHARLES J. MARSHALL (ABERDEEN) LTD
CHAPEL WORKS, BUCKSBURN, ABERDEEN, AB21 9TL.
Telephone: 01224 722777 Fax: 01224 724034
Email: charles@marshall-trailers.co.uk
www.marshall-trailers.co.uk
1

EC DECLARATION OF CONFORMITY
WE: CHARLES J. MARSHALL (ABERDEEN) LTD
CHAPEL WORKS, BUCKSBURN, ABERDEEN, SCOTLAND, AB21 9TL.
DECLARE THAT THE PRODUCT:
MAKE: CHARLES J. MARSHALL (ABERDEEN) LTD
TYPE: MARSHALL TANKER
MODEL: _______________________________
SERIAL NO: ______________
CONFORMS TO THE ESSENTIAL HEALTH & SAFETY REQUIREMENTS OF
89/392/EEC MACHINERY DIRECTIVE AS AMENDED BY 91/368/EEC DIRECTIVE.
PLACE OF ISSUE – CHAPEL WORKS, BUCKSBURN,
ABERDEEN, SCOTLAND, AB21 9TL.
NAME & TITLE OF AUTHORISED PERSON:
CHARLES R. MARSHALL
MANAGING DIRECTOR
DATE: ___________
WE ENCLOSE OUR INSTRUCTIONS FOR THE SAFE OPERATION OF THIS
MACHINE, THE WORKING OF WHICH IS FULLY UNDERSTOOD BY THE
UNDERSIGNED.
CUSTOMER’S SIGNATURE: _________________________ DATE: ___________
2

SAFETY INSTRUCTIONS
Important Safety advice!
1. STOP
2. THINK
3. CALL 01224 722777
Safety First: Please read and fully understand the contents of this instruction
manual, if you are in any doubt whatsoever of the safe operation of this
machine, please contact Charles J. Marshall (Aberdeen) Ltd on Tel. 01224
722777.
1. Guards - Ensure all guards are present and securely fastened in place.
2. Maintenance - Ensure the machine PTO and tractor is completely stopped and
secure prior to carrying out any maintenance.
3. PTO Shaft - Safety is important, if you are in any doubt of how to fit the PTO shaft,
please contact our service department.
4. Ensure that the pump is in the proper position for vacuum or pressure.
5. Ensure that the safety pressure relief valve is set and working correctly by lifting the
top round part, the pressure gauge should read no more than one bar – adjustment
is required if the pressure is higher than this.
6. Always apply the parking brake when the Tanker is to be left unhitched from the
tractor.
7. Hydraulic Valve – Always check that the valve is open when pump is creating
pressure or vacuum.
8. Before undoing any hatch, ensure the tanker is depressurised completely.
9. Before entering a slurry tanker, make sure it has been properly ventilated, the pump
is running and that the person entering has a rope attached, which should be held by
two people. Never close the entry hatch with someone inside.
10. As some gases released by agitated slurry may be flammable, never smoke or hold
up naked lights in the vicinity of the tanker.
11. Extreme care is required if discharging slurry near power lines.
3

OPERATING INSTRUCTIONS
All Pumps fitted to Marshall Tankers, have unfortunately, to be subject to the Manufacturer’s
warranty terms which are that if a Pump has worked successfully for more than three hours it cannot
be regarded as being of faulty manufacture.
YOUR MARSHALL TANKER HAS BEEN DESIGNED TO GIVE YOU LONG AND RELIABLE SERVICE.
THIS CAN BE ENSURED BY FOLLOWING THE INSTRUCTIONS BELOW.
General Operating Instructions
Operating the tanker – Couple up the 6” hose either on the side or at the rear to the bauer
coupling ensuring that the connection is airtight. Open the appropriate valve, place the
vacuum pump in the vacuum position then start the PTO (at low engine speeds). Operators
of tankers fitted with a hydraulic drive pump should ensure both hydraulic hoses are
connected to the tractor’s spool valves before engaging. Watch the gauge on the front and
take note of its reading as the hose becomes full, at this point increasing vacuum is pointless
as this is the point when the smallest amount of vacuum is lifting the liquid. By controlling
the PTO speed you will be able to maintain this situation. (This greatly reduces the risk of
over filling and reduces the amount of froth created during loading). When liquid becomes
visible in the sight glass immediately shut the appropriate valve, shut down the engine revs
and when the engine is idling shut off the pump. Uncouple the hose and change the pump
position to pressure.
When emptying the tanker allow the pressure to build up in the tanker then open the back
rear valve – never turn with the PTO running and always start and stop the pump at low
engine revs.
Hertell Pump Operating Instructions
Must be used in the 540 RPM PTO mode, the PTO speed must not exceed 350rpm.
There must be one oil drop, every one to two seconds, visible in the oiler. Remember this is
TOTAL oil loss, so MUST be checked and topped up daily to keep the oil above the mark on
the dip-stick.
Check the oil level in the front gear box housing regularly.
Due to the weight and speed at which the main pump rotor rotates it is vital that the input
PTO speed is low when the pump is started or stopped.
To help prolong the life of the pump it is advisable, after every 25 working hours, to pass
diesel through it. This can be done by placing the pump in the pressure position and holding
the container of diesel up to the exhaust on the pump the diesel will be sucked up through
the pump and will wash out the entire pump. KEEP THE PUMP TURNING for around 30
seconds then change the pump from pressure to vacuum – note the foul diesel will pass out
through the exhaust so some means of catching this is advisable to enable you to dispose of
this correctly. Continue the pump running for around 30 seconds this greatly prolongs not
only the pumps life but coats the top shut off valve.
This procedure MUST only be completed when the pump is cold and DO NOT STOP THE
PUMP UNTIL the diesel has dispersed fully.
4