Excavator is moved from one end to other end of project site either on chains or on wheels. The mobility with the former way of transport is poor, as excavator chains are heavy that restrict its speed to 4 kms/hour. The latter way of transport necessitates a standby truck/trailer, exclusively engaged for transporting excavator within site whenever required. Both alternatives suffer from their inherent limitations.
The chained transport for moving excavator within large project sites is time-consuming, wasteful on fuel, and damages paved site roads. The wheeled transport with standby truck/trailer for moving excavator within large project sites idles the truck/trailer and its driver when excavator is on active duty, and idles excavator engine when excavator is being transported. The alternative of arranging truck/trailer, when required, is neither practical nor attractive, as suitable truck/trailer is not necessarily available precisely at times when. excavator needs to be transported to other part of the site immediately. Dependence of excavator transport on arranged truck/trailer leads to loss of time required for arranged truck/trailer to reach the project site.
1.2 EXCAVATOR POWERED ENGINELESS TRUCK:
Excavator-powered engineless truck is developed by combining sssentially iunctionalities of truck/trailer and excavator,. aAer Lruck/trailer engine is replaced by an equivalent or suitably rated hydraulic motor. This is achieved in following five-step process. The steps are: L.2.1. Step-I: Removing Engine Disconnect truck engine from clutch, dismantle fuei lines, carburetor, radiator and other engine-oriented components. Clutch and gearbox are completely cleared oif engine and its accessories.
1.2.2 Step-II: Installing Hydraulic Motor on truck/trailer <BR> <BR> <BR> <BR> <BR> Hydraulic motor that closely matches torque output at specified revolutions s per minute is installed on truck/trailer and directly coupled into clutch and gearbox. It receives high pressure hydraulic oil from <BR> <BR> excavator oil pump by connecting it with the second output terminal of<BR> <BR> <BR> <BR> #change-over switch# as shown particularly in the accompanying drawing no. 01. t 2. 3 'Change-over switch' on excavator Output terminal of excavator oil pump is disconnected from two excavator motors. A change-over switch is installed and its input terminal is connected to pump output terminal. The twin output terminals of the 'change-over switch' are connected, as shown in the accompanying diagram no. 07, to a) excavator's two hydraulic motors' input terminals and b) truck/trailer hydraulic motor's input terminal as shown particularly in the accompanying drawings no. 02 and 03. The change-over switch is either manually operated (drawing no. 02) or electrically operated (drawing no. 03). <BR> <BR> <BR> <BR> <BR> <BR> <P>1.2.4 Step-IV: Installing 'Quick-Change Couplings' on engine<BR> <BR> <BR> <BR> <BR> hydraulic oil lines 'Quick Change Coupling' Sl-Plis installed near to truck/trailer motor on oil line TM connecting 1st output terminal of 'change-over switch' to truck/trailer hydraulic motor input terminal and the 2nd 'Quick-Change Coupling' S2-P2 is installed near to trllek/trailer on oil line IT- connecting output terminal of truck/trailer hydraulic motor to tank of the excavator, as shown particularly in the accompanying drawing no. zu 1. 2.5 Step-V: Installing Accelerator on Excavator An accelerator wire cable is connected to truck/trailer's accelerator pedal directly to fuel line that feeds fuel to excavator engine as shown particularly in the accompanying diagram 05.
With completion of the five-step process, the existing excavator is transformed into "Excavator-powered Engineless Truck/Trailer": The accompanying drawing no.06 illustrates how to connect 2 'Quick Change Coupling's. It illustrates that Truck/Tra-ler side terminals are fitted with 'plug' element and Excavator side terminals are fitted with 'socket' element of 'Quick change coupling'.
1.2.6 ECONOMIC BENEFITS: 'Excavator-powered engineless truck/trailer" accrues to its owner following economic benefits : i) Cost of truck/trailer engine, gearbox, and fuel accessories is saved. ii) Effectiveness of using it over large area of project site is considerably enhanced.
Lit) One operator in charge of excavator operation is operationally made capable of carrying out excavator 'transformation' and transporting it on site roads or on highway.
V) Dependence on external truck/trailer is almost eliminated.
2.0 OPERATION OF "EXCAVATOR POWERED ENGINELESS TRUCK/TRAILER" 2. 1 Truck 'Tata' make model no. LPT 1109 TURBO develops a torque of 26 kg-metre at 1800-2100 revolutions per minute (R.P.M.). This
truck is suitable ibr transporting excavator model no. TMX 20. The excavator oil pump develops a pressure of 150/under oil volumetric flow rate of 65. 4 litres per minute. Hydraulic motor model no. OMS 125, that delivers a torque of 28 kg-metres at 525 R. P. M. and is rated for maximum oil pressure of 150 bars, is selected.
2. 2 The ae of the truck is disengaged from its clutch and all engine accessories are cleared off. The hydraulic motor Model no. OMS 125, as selected and described in paragraph 2.1 herein above, is installed in the place of the removed engine and is coupled to the truck's
clutch and gearbox. 'Quick change couplings P1S1 and P2S2 are installed respectively on oil line TWI that connects 2 output line of the 'Change-over switch' to the Hydraulic motor of me truck and on the oil line TT that connects the hydraulic motor model no. OMS 125 output line to the oil tank of the excavator, as described m paragraph 1. 2. 4 hereinabove..
2.3 The excavator model No. TMX 20 is embarked on the modified truck Tata ta model No. LPT 1109 TURBO' and parked thereon, while the 'Change-over switch' is on 'Excavator Run' position. The Operator connects S1 and S2 terminals of the excavator respectively
to the P1 and p2 terminals of the truck, He also connects the loose end of the accelerator wire cable originating from FPE- the fuel pump of the Excavator to AT-truck cabin accelerator pedal.
2. 4 The Operator changes the 'Change-over switch' to Truck Run' Position. The oil pump, instead of pumping oil to twin hydraulic
motos of the excavator, continues pumping oil at 150 kg/cm2 pressure to the hydraulic motor of the truck, which is capable of delivering the torque of 28 kg-metres at the rotational speed of 525 R. P M as per its ratings.
2.5 The drop in the rotational speed of the "Engineless truck" is by a
factor of 4 (2100 R. P. M. 525 525 R.P.M.), which in turn allows the "Engineless truck" to transport the excavator at the highest speed of 30 Kilometres/hour (k.P.H.) from its pre- transformation speed of 120 kilometres/hour (120 K.P.H./4=30 K.P.H.). The "Excavator powered engineless truck" is now capable of transporting the excavator at the speed of 30 kilometres/hour - an amazing improvement in speed from 3 kilometres/hour excavator speed.
2.6 The Operator runs the "Excavator Powered Engineless Truck" on paved road and achieves the speed of 30.5 K.P.H., as calculated in paragraph 2.5 herein above. The 'Engineless Truck' is parked. n
The Operator places the 'Change-over switch' into 'Excavator Run' position to run the bigger and heavier excavator with the 'Engineless Truck' modified already. The Operator disconnects within 10 minutes AT from FPE, P1 from S1, and P2 from S2. The Operator disembarks the excavator model no. TMX 20 from the "Engineless Truck".
2. 8 Excavator Model No. EX60, 'Tata' make, a bigger excavator, is fitted
with the 'Change-over switch' whose 2nd output terminal is fitted with Sl-socket element of'Quick Change Coupling'P1S1. The Excavator oil tank is fitted with oil line TT which connects the oil tank to the hydraulic motor OMS 125, already installed through S2- socket element of'Quick Chane Coupling'P2S2.
2.9 The excavator 'Tata' make model no. EX60 is embarked onto the "Engineless Truck" and the Operator swiftly connects P1 to S1, P2 to S2, and a wire cable connecting FPE (Fuel Pump of the Excavator) to AT (Accelerator pedal of "Engineless Truck"), and the operator shifts the 'Change-over switch' to 'Truck Run' position. The 'Tata' make model no. EX60 excavator, being much bigger than TMX-20 model pumps oil at the rate of 172 litres/minute and the pressure of 150 kg/cm2 (pump can actually deliver at the maximum oil pressure of 280 kg/cm2).
210 10 e "Engineless Truck" powered by the excavator Model EX-60 transports the excavator at the speed of 80 K.P.H. {calculated speed is [172 L.P.M./65.4 L.P.M.]x[30 k.p.h.]=79 K.P.H.}.
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