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HilomastTelescopic MastsOPERATING INSTRUCTIONSPNEUMATIC MASTS& ACCESSORIESMKII RANGESouth Midlands CommunicationsIssue 3South Midlands Communicati

9To correct this, stand the mast at a vertical position and inject some Hilomast lubricating oil, allowing it to drain down inside the tubes. Then pu

10(1) Loosen the lower pan head screw on the stainless straps (if fitted with locking collars). Remove any sealing compound from screw holes to revea

11(5) Clean the tubes with a cloth and examine the tube surfaces. If there are dents or sufficient surface damage to affect the seals, then the secti

12PTFE Slide Ring Replacement (6a) The Teflon rings should be examined for scuffing and wear. If replacement is necessary they should be fitted befo

13NYLON KEY REPLACEMENT Tools required: 3mm Allen key and screwdriver, a fine file may also be needed. (1) For this operation, dismantle as describ

14FITTING INSTUCTIONS Magnets (1) Grease O-ring on magnet housing. (2) Remove mast cap and insert the magnets in their housing into the top tube,

15MAST MOUNTINGS There are several mounting arrangements available for the installation of masts. They can be mounted either internally or externall

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Mast A Dia B Dia C D E Min E Max F Min G H Min H Max J K M Dia NH5 NH7 NH9 89 89 89 38 38 38 1161 1586 2043 252 252 252 800 1000 1200 112

18NH NK NL NX FM VEHICLE BEARINGS (1) Select a suitable horizontal location for the roof bearing. Maximum and minimum installation dimensions are sh

CONTENTS Page Masts General Information………………………………………………………………………….3 Head Load and Guy Radii…………………………………………………………………..4 Safety……………………………………………………

19NY VEHICLE BEARINGS As can be seen on the drawing below, this mounting is constructed differently from the other vehicle bearing kits before, and

20(1) Select a suitable horizontal location for the roof bearing. Maximum and minimum installation dimensions are shown on pages 16 and 17. Ensure th

21BASE GUY ASSEMBLY This arrangement is generally the easiest method of erecting a mast on open ground. The kit is complete with the mast fittings,

22 TRIPOD STAND FOR NH MASTS Fitting instructions Before the tripod stand can be used, the top bearing must be fitted to the mast as follows: (1)

23 Erecting Instructions (1) Place the stand in position on the ground and hinge the three legs out into horizontal position. (2) Place the mast i

24 FIELD STAND (N4L/102) FOR NK MASTS (1) Remove inlet valve with box spanner provided. (2) On the NK16 masts only, fit the first split collar app

25COMPRESSORS GENERAL INFORMATION Hilomast compressors are air cooled, oil-less electric motors of the diaphragm type enclosed in a steel case. All

26TYPES OF COMPRESSORS Type NC1 Single unit Output: 17 litres/minute at 0.7kg/cm² Fuses: 12VDC = 10A, direct switching 24VDC = 5A, d

27OPERATING INSTRUCTIONS NC1 Unit (1) Connect compressor to suitable power supply. (2) Connect airline to mast inlet valve. (3) Close exhaust

28SETTING COMPRESSOR PRESSURE Setting Pressure Switch in the Compressor Set pressure switch only when pressure is applied to the system. A gauge mu

2IMPORTANT INFORMATION Before using the mast carefully read the operating instructions herein. DO NOT use the mast unless it is fully extended.

29USE OF THIRD PARTY COMPRESSORS When using third party compressors, ensure that the tank pressure is set to a maximum of 25 p.s.i. To ensure proper

South Midlands CommunicationsS.M.House, School Close,Chadlerds Ford Ind. Est.Eastleigh, Hampshire,England. SO53 4BYTel: (+44)0 23 8024 6200Fax: (+44)0

3MASTS GENERAL INFORMATION Telescopic masts are considered to be temporary structures and should not be expected to withstand all weather condition

4LOADINGS – WIND SPEEDS – GUY RADII FOR HILOMASTS Vertical headload Maximum wind speed unguyed Maximum wind speed with top guys Antenna side surface

5SAFETY At times be aware of overhead obstructions especially power lines (we recommend use of the Sigalarm, high voltage power line proximity warni

6OPERATING INSTRUCTIONS NH/NK/NL/NX Series Hilomasts (1) Close the mast exhaust valve by turning in a clockwise direction until finger tight. (2

7Note: The locking collars are adjusted during assembly. However, if any locking collar is not clamping the section securely when fully tightened, if

8MAINTENANCE AND REPAIR Mast maintenance Inspect and lubricate mast sections at four-week intervals or every 200 operations, whichever occurs first