From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from Smith's Jacking Systems Ltd. regarding a faulty Bentley Hydrolift jack and filling instructions.
| Identifier | ExFiles\Box 140\2\ scan0170 | |
| Date | 29th March 1939 | |
| 1166 TELEPHONE: GLADSTONE 6671-2 SMITH'S JACKING SYSTEMS LTD. DIRECTORS: A.{Mr Adams} GORDON SMITH, CHAIRMAN D.{John DeLooze - Company Secretary} W. SESSIONS, GENERAL MANAGER. C. W. NICHOLS. R.{Sir Henry Royce} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} SMITH. EDGWARE ROAD - CRICKLEWOOD - LONDON, N.W.2 Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}8/MH{M. Huckerby} 29th March, 1939 Messrs.Rolls-Royce Ltd., D E R B Y. For the attention of S.H.Grylls, Esq. Dear Sirs, We thank you for your letter of the 28th instant concerning the trouble you have experienced with one of the Bentley Hydrolift jacks. We note that this jack failed to lift, and when you dismantled it no spring was found under the replenishment valve. This condition is very extraordinary, as a spring is always fitted under the replenishment ball valve to overcome the gravity which obviously keeps this ball away from the seat. Will you be good enough to return the jack in question to us, as we should like to find out what has happened to this spring and try and ascertain if this was fitted in the first place. Incidentally, it does not matter if the foot of the jack is pulled down by the operator as the piston is fitted with a two-way gland - one opposing hydraulic pressure and the other opposing atmospheric pressure. With regard to the filling of Hydrolift jacks, this should be done as follows. Lay the jack on its side with the filler plug upwards and by means of the foot, pull out slowly the jack plunger at the same time the fluid is poured through the filler hole. The plunger should then be pushed slowly back until all the air escapes through the filler hole. The filler -contd- | ||