III. MAINTENANCE – EVERY 3 MONTHS

A.Check that the oven is cool and the power is discon- nected, as described in the warning at the beginning of this Section.

B.Vacuum both of the blower mounts, and their surrounding compartments, using a shop vacuum.

C.Tighten all electrical terminal screws.

D.Split Belt Disassembly and Cleaning

1.Refer to Part D, Conveyor Installation, in the Installa- tion section of this Manual. Then, remove the following components from the oven:

•Conveyor end stop

•Crumb trays

•Chain cover

•Drive chains

•End plugs

•Conveyor assembly

2.Remove the master links from each conveyor belt. Then, roll the belts up along the length of the conveyor to remove them from the frame.

3.Remove the two conveyor adjustment screws from the idler end of the conveyor frame, as shown in Figure 4-4.

4.Remove the idler shaft assembly from the conveyor.

5.Pull apart the two sections of the idler shaft.

6.Clean the shafts thoroughly using a rag. Then, lubri-cate both the extended shaft and the interior of the hollow shaft using a light food-grade lubricant. DO NOT lubricate the shafts using WD40 or a similar product. This can cause the shafts to wear rapidly.

7.Before reassembling the shafts into the conveyor frame, check that they are oriented properly.

Figure 4-4. Disassembling the idler shaft

8.Reassemble the idler shaft into the conveyor. Make sure that the bronze washer is in place between the two sections of the shaft. See Figure 4-4.

9.Replace the conveyor adjustment screws as shown in Figure 4-4. To allow the conveyor belt to be reinstalled later, do not tighten the screws at this time.

10.Loosen the set screw on both of the conveyor drive sprockets. Then, remove the sprockets from the shaft.

11.Check the conveyor configuration as follows:

High-speed conveyors are equipped with large flange bearings at both ends of the shaft, as shown in Figure 4-5. For these conveyors, remove the two screws that hold each bearing to the conveyor frame. With the screws removed, lift the end of the shaft at the front of the oven, and pull the entire assembly free of the conveyor frame.

Standard conveyors are equipped with bronze bush- ings mounted on spacers at both ends of the shaft, as shown in Figure 4-5. For these convey-ors, remove the two screws that hold the bracket to the conveyor frame. With the screws removed, lift the end of the shaft at the front of the oven, and pull the entire assembly free of the conveyor frame. The brackets will be removed along with the drive shaft assembly.

12.Disassemble and lubricate the two sections of the drive shaft as described for the idler shaft, above.

13.Before reassembling the shafts into the conveyor frame, check that they are oriented properly.

14.Reassemble the drive shaft into the conveyor. Make sure that the bronze washer is in place between the two sections of the shaft. See Figure 4-4.

15.Replace the drive sprockets. Reassemble the belts and master links onto the conveyor.

16.Reinstall the end plugs and conveyor onto the oven.

17.Reattach the drive chains. Replace the chain cover.

18.Check the tension of the conveyor belt as shown in

Figure 2-14 (in Section 2, Installation). The belt should lift about 1″ (25mm). If necessary, adjust the belt tension by turning the conveyor adjustment screws.

19.Replace all components onto the oven.

Figure 4-5. Drive shaft configurations

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Middleby Marshall PS840 Series installation manual III. Maintenance Every 3 Months, Split Belt Disassembly and Cleaning
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PS840 Series specifications

The Middleby Marshall PS840 Series is a high-performance conveyor oven designed to deliver outstanding cooking results with efficiency and speed. This series is renowned in the foodservice industry for its advanced technology and user-friendly design, making it an ideal choice for restaurants, pizza shops, and other commercial kitchens that require consistent high-quality food production.

One of the standout features of the PS840 Series is its innovative design that utilizes a patented Cookstar Technology. This technology promotes even cooking by ensuring that hot air circulates consistently throughout the oven chamber. The result is perfectly baked pizzas, evenly cooked dishes, and enhanced flavor, making it a favorite among chefs and kitchen staff alike.

The PS840 offers a variable-speed conveyor system that allows users to adjust cooking times according to the specific requirements of different food items. This flexibility enables operators to achieve precise results, whether they are baking thin-crust pizzas or roasting vegetables. Additionally, the oven reaches optimal cooking temperatures quickly, minimizing wait times during peak service hours.

Energy efficiency is another key characteristic of the Middleby Marshall PS840 Series. Built with high-quality insulation and advanced heating elements, this series is designed to significantly reduce energy consumption while maintaining performance. This not only lowers operational costs but also supports sustainable practices in the foodservice industry.

The PS840 Series includes a user-friendly digital control panel that makes it easy for operators to set cooking times and temperatures, monitor performance, and switch between cooking modes. This intuitive interface reduces the learning curve for new staff and enhances overall productivity in busy kitchens.

Another notable feature of the PS840 Series is its durability. Constructed with robust materials, this oven is designed to withstand the wear and tear of a commercial kitchen environment. Its easy-to-clean surfaces and removable conveyor belt further enhance its maintenance convenience, allowing kitchens to maintain high hygiene standards with ease.

In summary, the Middleby Marshall PS840 Series stands out in the market for its exceptional cooking performance, energy efficiency, user-friendly controls, and robust design. These features make it a versatile and reliable choice for any establishment looking to enhance their food production capabilities while delivering quality dishes consistently. Whether utilized for baking, roasting, or reheating, the PS840 Series excels in meeting the demands of the modern foodservice industry.
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